diff --git a/controller/Dockerfile b/controller/Dockerfile
index a12afdf..378a60f 100644
--- a/controller/Dockerfile
+++ b/controller/Dockerfile
@@ -8,6 +8,12 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 
 WORKDIR /app
 
+# ffmpeg для snapshot endpoint — нужен basic CPU build (RTSP read + PNG output).
+# Размер: ~120 MB additional (ffmpeg + libs); приемлемо для controller image.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        ffmpeg \
+    && rm -rf /var/lib/apt/lists/*
+
 # Install deps первым layer — пересборка только при изменении pyproject.toml
 COPY pyproject.toml ./
 RUN pip install --no-cache-dir \
@@ -20,7 +26,8 @@ RUN pip install --no-cache-dir \
     pyyaml \
     structlog \
     typer \
-    sse-starlette
+    sse-starlette \
+    pillow
 
 # Source code
 COPY cuda_grid_controller ./cuda_grid_controller
diff --git a/controller/cuda_grid_controller/__main__.py b/controller/cuda_grid_controller/__main__.py
index c13e271..432089a 100644
--- a/controller/cuda_grid_controller/__main__.py
+++ b/controller/cuda_grid_controller/__main__.py
@@ -13,6 +13,7 @@ import uvicorn
 
 from .config import Config
 from .dispatch import CommandDispatcher
+from .dynamic_overlays import ChartCfg, ChatCfg, DynamicRenderer
 from .frigate_bridge import FrigateBridge, FrigateBridgeCfg
 from .http_api import create_app
 from .mqtt_loop import MqttLoop
@@ -55,7 +56,26 @@ async def _run(cfg: Config) -> None:
                 "frigate_bridge.config_invalid", error=str(e)
             )
 
-    mqtt = MqttLoop(cfg, state, dispatcher.handle, frigate_bridge=frigate_bridge)
+    # Dynamic overlays (charts/chats) — Phase 6
+    dynamic_renderer: DynamicRenderer | None = None
+    if cfg.dynamic_overlays:
+        try:
+            d = cfg.dynamic_overlays
+            charts = [ChartCfg.model_validate(c) for c in (d.get("charts") or [])]
+            chats = [ChatCfg.model_validate(c) for c in (d.get("chats") or [])]
+            if charts or chats:
+                dynamic_renderer = DynamicRenderer(
+                    icon_dir=Path(cfg.icon_dir),
+                    dispatcher=dispatcher,
+                    charts=charts,
+                    chats=chats,
+                )
+        except Exception as e:
+            structlog.get_logger().warning("dynamic_overlays.config_invalid", error=str(e))
+
+    mqtt = MqttLoop(cfg, state, dispatcher.handle,
+                    frigate_bridge=frigate_bridge,
+                    dynamic_renderer=dynamic_renderer)
 
     # Wire dispatcher events → MQTT publishes
     dispatcher.on_state_change = mqtt.publish_state
@@ -80,6 +100,10 @@ async def _run(cfg: Config) -> None:
         http=f"{cfg.http.host}:{cfg.http.port}",
     )
 
+    # Start dynamic renderer задачи (если есть)
+    if dynamic_renderer:
+        await dynamic_renderer.start()
+
     try:
         await asyncio.gather(
             mqtt.run(),
@@ -88,6 +112,8 @@ async def _run(cfg: Config) -> None:
     except asyncio.CancelledError:
         log.info("controller.shutdown")
     finally:
+        if dynamic_renderer:
+            await dynamic_renderer.stop()
         await dispatcher.close()
         await mqtt.stop()
 
diff --git a/controller/cuda_grid_controller/config.py b/controller/cuda_grid_controller/config.py
index 3e61249..f53d5d2 100644
--- a/controller/cuda_grid_controller/config.py
+++ b/controller/cuda_grid_controller/config.py
@@ -64,6 +64,37 @@ class InstanceCfg(BaseModel):
         default="Parsed_cuda_grid_0",
         description="Filter target name в FFmpeg filter graph (для process_command)",
     )
+    output_rtsp_url: str | None = Field(
+        default=None,
+        description="URL куда pipeline push'ит composed stream — controller read'ит для snapshot/preview endpoints",
+    )
+    audio_sources: list["AudioSourceCfg"] = Field(
+        default_factory=list,
+        description="Audio sources для astreamselect switching (Phase 5b)",
+    )
+    audio_filter_target: str = Field(
+        default="astreamselect@as",
+        description="Target filter для ZMQ команд переключения audio (должен соответствовать pipeline filter_complex)",
+    )
+    music_volume_target: str = Field(
+        default="volume@music",
+        description="Target filter для управления громкостью music chain (Phase 5c ducking)",
+    )
+    intercom_volume_target: str = Field(
+        default="volume@intercom",
+        description="Target filter для управления громкостью intercom (Phase 5c)",
+    )
+    music_ducked_volume: float = Field(
+        default=0.2, ge=0.0, le=1.0,
+        description="Громкость music когда intercom активен (0.2 = -14 dB)",
+    )
+
+
+class AudioSourceCfg(BaseModel):
+    """Описание audio source в порядке как они добавлены в pipeline -i ..."""
+    name: str = Field(description="Уникальное имя для API (e.g. 'europa_plus')")
+    index: int = Field(ge=0, description="Index в astreamselect inputs (соответствует порядку -i в pipeline)")
+    label: str | None = Field(default=None, description="UI-friendly label (default = name)")
 
     @field_validator("name")
     @classmethod
@@ -97,6 +128,12 @@ class Config(BaseModel):
     log: LogCfg = LogCfg()
     # Frigate bridge — late import чтобы избежать circular dep
     frigate: dict | None = None  # parsed в FrigateBridgeCfg при runtime
+    # Dynamic overlays (charts/chats) — late import тоже
+    dynamic_overlays: dict | None = None  # parsed в DynamicRenderer cfg
+    icon_dir: str = Field(
+        default="/var/lib/cuda-grid/icons",
+        description="Shared volume куда controller пишет dynamic PNG; filter (`icon_dir=` option) читает оттуда",
+    )
 
     @classmethod
     def from_yaml(cls, path: Path | str) -> Self:
diff --git a/controller/cuda_grid_controller/dispatch.py b/controller/cuda_grid_controller/dispatch.py
index e68f9a7..47c0648 100644
--- a/controller/cuda_grid_controller/dispatch.py
+++ b/controller/cuda_grid_controller/dispatch.py
@@ -127,11 +127,83 @@ class CommandDispatcher:
                 await self._overlay_remove(inst, payload.strip())
             case "overlay.clear":
                 await self._overlay_clear(inst)
+            case "audio.set":
+                await self._audio_set(inst, payload.strip())
+            case "intercom.start":
+                await self._intercom_set(inst, active=True)
+            case "intercom.end":
+                await self._intercom_set(inst, active=False)
             case _:
                 log.warning(
                     "dispatch.unknown_kind", instance=instance_name, kind=kind
                 )
 
+    # ─── Audio ─────────────────────────────────────────────────────
+
+    async def _audio_set(self, inst: InstanceCfg, source_name: str) -> None:
+        """Switch audio к source_name через ZMQ команду astreamselect map <index>."""
+        if not inst.audio_sources:
+            log.warning("dispatch.no_audio_sources", instance=inst.name)
+            return
+        src = next((s for s in inst.audio_sources if s.name == source_name), None)
+        if src is None:
+            log.warning("dispatch.unknown_audio_source",
+                        instance=inst.name, source=source_name,
+                        available=[s.name for s in inst.audio_sources])
+            return
+
+        client = self._client(inst)
+        try:
+            reply = await client.send_command(
+                inst.audio_filter_target, "map", str(src.index)
+            )
+            log.info("dispatch.audio_set", instance=inst.name,
+                     source=source_name, index=src.index, ffmpeg_reply=reply)
+        except (TimeoutError, Exception) as e:
+            log.error("dispatch.audio_zmq_fail", instance=inst.name, error=str(e))
+            return
+
+        if self.on_state_change:
+            await self.on_state_change(inst.name, "audio_source", source_name)
+        if self.on_event:
+            await self.on_event(
+                inst.name, "audio_switched", {"to": source_name, "index": src.index}
+            )
+
+    async def _reload_icon(self, instance: str, icon_name: str) -> None:
+        """Invalidate cached icon atlas в filter — used by DynamicRenderer."""
+        inst = self._find_instance(instance)
+        if inst is None:
+            return
+        client = self._client(inst)
+        try:
+            await client.send_command(inst.filter_target, "reload_icon", icon_name)
+        except (TimeoutError, Exception) as e:
+            log.warning("dispatch.reload_icon_fail", instance=instance, icon=icon_name, error=str(e))
+
+    async def _intercom_set(self, inst: InstanceCfg, active: bool) -> None:
+        """Ducking pattern: при intercom ON → music volume ↓ + intercom ↑.
+        После end — restore. Volume commands отправляются параллельно."""
+        client = self._client(inst)
+        music_vol = inst.music_ducked_volume if active else 1.0
+        intercom_vol = 1.0 if active else 0.0
+
+        try:
+            r1 = await client.send_command(inst.music_volume_target, "volume", str(music_vol))
+            r2 = await client.send_command(inst.intercom_volume_target, "volume", str(intercom_vol))
+            log.info("dispatch.intercom",
+                     instance=inst.name, active=active,
+                     music_vol=music_vol, intercom_vol=intercom_vol,
+                     music_reply=r1, intercom_reply=r2)
+        except (TimeoutError, Exception) as e:
+            log.error("dispatch.intercom_zmq_fail", instance=inst.name, error=str(e))
+            return
+
+        if self.on_event:
+            await self.on_event(
+                inst.name, "intercom", {"active": active, "music_vol": music_vol}
+            )
+
     # ─── Layout ────────────────────────────────────────────────────
 
     async def _set_layout(self, inst: InstanceCfg, layout: str) -> None:
diff --git a/controller/cuda_grid_controller/dynamic_overlays.py b/controller/cuda_grid_controller/dynamic_overlays.py
new file mode 100644
index 0000000..d799b2b
--- /dev/null
+++ b/controller/cuda_grid_controller/dynamic_overlays.py
@@ -0,0 +1,274 @@
+"""Dynamic overlay renderer (Phase 6).
+
+Controller рендерит chart/chat overlays через PIL → PNG в shared volume,
+затем посылает filter команду `reload_icon` чтобы invalidate cache. Filter
+re-reads PNG file при следующем render.
+
+Файлы кладутся в `${icon_dir}/${overlay_id}.png` где icon_dir = mount к
+volume общий с pipeline (filter ищет тут).
+"""
+
+from __future__ import annotations
+
+import asyncio
+import math
+import time
+from collections import deque
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import structlog
+from PIL import Image, ImageDraw, ImageFont
+from pydantic import BaseModel, Field
+
+from .overlays import IconOverlay
+
+if TYPE_CHECKING:
+    from .dispatch import CommandDispatcher
+
+log = structlog.get_logger()
+
+
+# ─── Config ───────────────────────────────────────────────────────────
+
+class ChartCfg(BaseModel):
+    """Live chart overlay."""
+    id: str = Field(description="Уникальное имя — становится PNG file name + overlay_id")
+    target_instance: str
+    cell: int | None = None      # None = absolute
+    x: float = Field(ge=0.0, le=1.0)
+    y: float = Field(ge=0.0, le=1.0)
+    w_px: int = Field(default=320, ge=64, le=1920)
+    h_px: int = Field(default=120, ge=32, le=1080)
+    title: str = ""
+    data_topic: str | None = Field(
+        default=None,
+        description="MQTT topic с numeric payload. Если None — fake sine wave для demo.",
+    )
+    refresh_sec: float = Field(default=2.0, ge=0.5, le=60.0)
+    max_points: int = Field(default=60, ge=10, le=600)
+    line_color: tuple[int, int, int] = (0, 255, 128)
+    bg_color: tuple[int, int, int, int] = (0, 0, 0, 180)
+    opacity: float = 1.0
+    z_order: int = 25
+
+
+class ChatCfg(BaseModel):
+    """Scrolling text notifications."""
+    id: str
+    target_instance: str
+    cell: int | None = None
+    x: float = Field(ge=0.0, le=1.0)
+    y: float = Field(ge=0.0, le=1.0)
+    w_px: int = Field(default=400, ge=64, le=1920)
+    h_px: int = Field(default=200, ge=32, le=1080)
+    source_topic: str | None = Field(default=None, description="MQTT topic — каждое сообщение = новая строка")
+    max_messages: int = Field(default=10, ge=1, le=50)
+    font_size: int = Field(default=18, ge=10, le=64)
+    text_color: tuple[int, int, int] = (255, 255, 255)
+    bg_color: tuple[int, int, int, int] = (0, 0, 0, 150)
+    opacity: float = 1.0
+    z_order: int = 26
+
+
+# ─── Renderers ────────────────────────────────────────────────────────
+
+class _FontCache:
+    _font: ImageFont.FreeTypeFont | None = None
+
+    @classmethod
+    def get(cls, size: int) -> ImageFont.FreeTypeFont | ImageFont.ImageFont:
+        try:
+            return ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", size=size)
+        except OSError:
+            return ImageFont.load_default()
+
+
+def render_chart(cfg: ChartCfg, data: list[float]) -> Image.Image:
+    """Line chart с title. Returns RGBA Image."""
+    img = Image.new("RGBA", (cfg.w_px, cfg.h_px), cfg.bg_color)
+    draw = ImageDraw.Draw(img)
+    pad = 8
+
+    # Title
+    if cfg.title:
+        font = _FontCache.get(14)
+        draw.text((pad, 2), cfg.title, fill=(255, 255, 255), font=font)
+        chart_top = 20
+    else:
+        chart_top = pad
+    chart_bottom = cfg.h_px - pad
+    chart_left = pad
+    chart_right = cfg.w_px - pad
+    chart_h = chart_bottom - chart_top
+    chart_w = chart_right - chart_left
+
+    # Border
+    draw.rectangle([chart_left, chart_top, chart_right, chart_bottom],
+                   outline=(128, 128, 128, 200), width=1)
+
+    if len(data) >= 2:
+        lo, hi = min(data), max(data)
+        span = (hi - lo) or 1.0
+        points: list[tuple[float, float]] = []
+        for i, v in enumerate(data):
+            px = chart_left + (i / (len(data) - 1)) * chart_w
+            py = chart_bottom - ((v - lo) / span) * chart_h
+            points.append((px, py))
+        draw.line(points, fill=cfg.line_color, width=2)
+        # Last value label
+        font = _FontCache.get(12)
+        last = data[-1]
+        draw.text((chart_right - 50, chart_top + 2), f"{last:.1f}",
+                  fill=cfg.line_color, font=font)
+
+    return img
+
+
+def render_chat(cfg: ChatCfg, messages: list[str]) -> Image.Image:
+    """Vertical list — last N messages at bottom."""
+    img = Image.new("RGBA", (cfg.w_px, cfg.h_px), cfg.bg_color)
+    draw = ImageDraw.Draw(img)
+    font = _FontCache.get(cfg.font_size)
+    pad = 6
+
+    line_h = cfg.font_size + 4
+    visible = messages[-cfg.max_messages:]
+    y = cfg.h_px - pad - line_h
+    for msg in reversed(visible):
+        if y < pad:
+            break
+        draw.text((pad, y), msg[:80], fill=cfg.text_color, font=font)
+        y -= line_h
+
+    return img
+
+
+# ─── Runner ──────────────────────────────────────────────────────────
+
+class DynamicRenderer:
+    """Управляет рендерингом charts/chats — пишет PNG + посылает reload_icon."""
+
+    def __init__(
+        self,
+        icon_dir: Path,
+        dispatcher: "CommandDispatcher",
+        charts: list[ChartCfg],
+        chats: list[ChatCfg],
+    ) -> None:
+        self.icon_dir = icon_dir
+        self.dispatcher = dispatcher
+        self.charts = charts
+        self.chats = chats
+        # State
+        self._chart_data: dict[str, deque[float]] = {
+            c.id: deque(maxlen=c.max_points) for c in charts
+        }
+        self._chat_messages: dict[str, deque[str]] = {
+            c.id: deque(maxlen=c.max_messages) for c in chats
+        }
+        self._tasks: list[asyncio.Task] = []
+        self._start_time = time.time()
+
+    def topics_to_subscribe(self) -> list[str]:
+        topics = []
+        for c in self.charts:
+            if c.data_topic:
+                topics.append(c.data_topic)
+        for c in self.chats:
+            if c.source_topic:
+                topics.append(c.source_topic)
+        return topics
+
+    def handle_message(self, topic: str, payload: str) -> None:
+        """Update buffer when MQTT data arrives. Caller — mqtt_loop."""
+        for c in self.charts:
+            if c.data_topic == topic:
+                try:
+                    self._chart_data[c.id].append(float(payload.strip()))
+                except ValueError:
+                    log.warning("dynamic.bad_chart_value", id=c.id, payload=payload[:50])
+                return
+        for c in self.chats:
+            if c.source_topic == topic:
+                self._chat_messages[c.id].append(payload.strip())
+                return
+
+    async def start(self) -> None:
+        """Spawn render tasks per overlay."""
+        self.icon_dir.mkdir(parents=True, exist_ok=True)
+        for cfg in self.charts:
+            self._tasks.append(asyncio.create_task(self._chart_loop(cfg)))
+        for cfg in self.chats:
+            self._tasks.append(asyncio.create_task(self._chat_loop(cfg)))
+        log.info("dynamic.started", charts=len(self.charts), chats=len(self.chats))
+
+    async def stop(self) -> None:
+        for t in self._tasks:
+            t.cancel()
+        for t in self._tasks:
+            try:
+                await t
+            except asyncio.CancelledError:
+                pass
+        self._tasks.clear()
+
+    async def _chart_loop(self, cfg: ChartCfg) -> None:
+        registered = False
+        while True:
+            try:
+                buf = self._chart_data[cfg.id]
+                # Demo data если нет MQTT topic
+                if cfg.data_topic is None:
+                    t = time.time() - self._start_time
+                    buf.append(20.0 + 10.0 * math.sin(t / 5))
+                await self._render_and_publish(cfg, lambda: render_chart(cfg, list(buf)))
+                if not registered:
+                    await self._register_overlay(cfg.id, cfg.target_instance, cfg.cell,
+                                                  cfg.x, cfg.y, cfg.opacity, cfg.z_order)
+                    registered = True
+                await asyncio.sleep(cfg.refresh_sec)
+            except asyncio.CancelledError:
+                raise
+            except Exception as e:
+                log.error("dynamic.chart_loop_fail", id=cfg.id, error=str(e))
+                await asyncio.sleep(5)
+
+    async def _chat_loop(self, cfg: ChatCfg) -> None:
+        registered = False
+        last_signature: tuple[str, ...] = ()
+        while True:
+            try:
+                msgs = list(self._chat_messages[cfg.id])
+                sig = tuple(msgs)
+                if sig != last_signature or not registered:
+                    await self._render_and_publish(cfg, lambda: render_chat(cfg, msgs))
+                    last_signature = sig
+                    if not registered:
+                        await self._register_overlay(cfg.id, cfg.target_instance, cfg.cell,
+                                                      cfg.x, cfg.y, cfg.opacity, cfg.z_order)
+                        registered = True
+                await asyncio.sleep(0.5)  # tight check для chat reactivity
+            except asyncio.CancelledError:
+                raise
+            except Exception as e:
+                log.error("dynamic.chat_loop_fail", id=cfg.id, error=str(e))
+                await asyncio.sleep(5)
+
+    async def _render_and_publish(self, cfg, render_fn) -> None:
+        path = self.icon_dir / f"{cfg.id}.png"
+        tmp = path.with_suffix(".png.tmp")
+        img = render_fn()
+        img.save(tmp, "PNG")
+        tmp.replace(path)
+        # Tell filter to invalidate cached atlas — next render re-reads file
+        await self.dispatcher._reload_icon(cfg.target_instance, cfg.id)
+
+    async def _register_overlay(self, ov_id, instance, cell, x, y, opacity, z_order) -> None:
+        """Initial register — add IconOverlay referencing icon_name=<id>."""
+        ov = IconOverlay(
+            id=ov_id, cell=cell, name=ov_id,   # icon name = same as overlay id
+            x=x, y=y, size=0.1,                 # size игнорируется filter'ом — use native PNG dims
+            opacity=opacity, z_order=z_order,
+        )
+        await self.dispatcher.handle(instance, "overlay.add", ov.model_dump_json())
diff --git a/controller/cuda_grid_controller/frigate_bridge.py b/controller/cuda_grid_controller/frigate_bridge.py
index 679e774..f05ffc1 100644
--- a/controller/cuda_grid_controller/frigate_bridge.py
+++ b/controller/cuda_grid_controller/frigate_bridge.py
@@ -21,7 +21,7 @@ from typing import TYPE_CHECKING
 import structlog
 from pydantic import BaseModel, Field
 
-from .overlays import RectOverlay, TextOverlay
+from .overlays import DimOverlay, RectOverlay, TextOverlay
 
 if TYPE_CHECKING:
     from .dispatch import CommandDispatcher
@@ -54,12 +54,24 @@ class BorderTheme(BaseModel):
     motion_opacity: float = Field(default=1.0, ge=0.0, le=1.0)
 
 
+class FocusTheme(BaseModel):
+    """Auto-focus: при motion на одной cell — затемнение остальных.
+    Если motion на 2+ cells одновременно — focus не применяется (no obvious focus)."""
+
+    enabled: bool = True
+    dim_color: str = "#000000"
+    dim_factor: float = Field(default=0.6, ge=0.0, le=1.0,
+        description="0.0=без затемнения, 1.0=полное черное")
+
+
 class FrigateBridgeCfg(BaseModel):
     enabled: bool = False
     base_topic: str = "frigate"
     mappings: list[FrigateCameraMapping] = []
     border_theme: BorderTheme = Field(default_factory=BorderTheme,
         description="Стиль cell borders — idle/motion цвета")
+    focus_theme: FocusTheme = Field(default_factory=FocusTheme,
+        description="Auto-focus: dim non-active cells когда motion на одной")
 
 
 class FrigateBridge:
@@ -78,6 +90,7 @@ class FrigateBridge:
         self._event_overlays: dict[str, tuple[str, str]] = {}
         self._borders_initialized: dict[str, bool] = {}  # target_instance → bool
         self._cell_states: dict[str, set[str]] = {}      # "<inst>:<cell>" → set of active cameras с motion
+        self._focus_dims: dict[str, set[int]] = {}       # instance → set of cells which сейчас затемнены
 
     def topics_to_subscribe(self) -> list[str]:
         if not self.cfg.enabled:
@@ -176,6 +189,57 @@ class FrigateBridge:
 
         if is_active != was_active:
             await self._set_border_state(mapping.target_instance, mapping.cell, motion=is_active)
+            await self._update_focus(mapping.target_instance)
+
+    def _cell_dim_id(self, cell: int) -> str:
+        return f"cell_{cell}_focus_dim"
+
+    async def _update_focus(self, instance: str) -> None:
+        """Auto-focus logic:
+          0 active cells  → no dim (remove all focus dims)
+          1 active cell   → dim non-focus cells (focus mode ON)
+          2+ active cells → no dim (too many — no obvious single focus)
+        """
+        if not self.dispatcher or not self.cfg.focus_theme.enabled:
+            return
+
+        # Active cells для этого instance
+        active_cells = {
+            int(key.split(":", 1)[1])
+            for key, cams in self._cell_states.items()
+            if cams and key.startswith(f"{instance}:")
+        }
+        all_cells = sorted({m.cell for m in self.cfg.mappings if m.target_instance == instance})
+        currently_dimmed = self._focus_dims.setdefault(instance, set())
+
+        target_dimmed: set[int]
+        if len(active_cells) == 1:
+            focus_cell = next(iter(active_cells))
+            target_dimmed = {c for c in all_cells if c != focus_cell}
+        else:
+            target_dimmed = set()
+
+        to_add = target_dimmed - currently_dimmed
+        to_remove = currently_dimmed - target_dimmed
+
+        theme = self.cfg.focus_theme
+        for cell in to_add:
+            ov = DimOverlay(
+                id=self._cell_dim_id(cell),
+                cell=cell,
+                x=0.0, y=0.0, w=1.0, h=1.0,
+                color=theme.dim_color,
+                dim_factor=theme.dim_factor,
+                z_order=1,    # под bbox (20) и border (5) но над cell content
+            )
+            await self.dispatcher.handle(instance, "overlay.add", ov.model_dump_json())
+            currently_dimmed.add(cell)
+        for cell in to_remove:
+            await self.dispatcher.handle(instance, "overlay.remove", self._cell_dim_id(cell))
+            currently_dimmed.discard(cell)
+
+        if to_add or to_remove:
+            log.info("focus.updated", instance=instance, active=sorted(active_cells), dimmed=sorted(target_dimmed))
 
     async def _handle_event(self, event: dict) -> None:
         event_type = event.get("type", "?")
diff --git a/controller/cuda_grid_controller/http_api.py b/controller/cuda_grid_controller/http_api.py
index c8f4366..8bfa20f 100644
--- a/controller/cuda_grid_controller/http_api.py
+++ b/controller/cuda_grid_controller/http_api.py
@@ -2,10 +2,12 @@
 
 from __future__ import annotations
 
+import asyncio
 from typing import Any
 
 import structlog
 from fastapi import Body, FastAPI, HTTPException
+from fastapi.responses import Response
 from pydantic import BaseModel, TypeAdapter
 
 from .config import Config
@@ -21,6 +23,10 @@ class LayoutSetReq(BaseModel):
     layout: str
 
 
+class AudioSetReq(BaseModel):
+    source: str
+
+
 def create_app(
     cfg: Config, state: ControllerState, dispatcher: CommandDispatcher
 ) -> FastAPI:
@@ -100,6 +106,80 @@ def create_app(
         await dispatcher.handle(instance, "overlay.clear", "")
         return {"ok": True}
 
+    # ─── Audio ─────────────────────────────────────────────────────
+
+    @app.get("/audio/{instance}")
+    async def audio_list(instance: str) -> dict[str, Any]:
+        inst = _check_instance(instance)
+        return {
+            "instance": instance,
+            "sources": [
+                {"name": s.name, "index": s.index, "label": s.label or s.name}
+                for s in inst.audio_sources
+            ],
+        }
+
+    @app.post("/audio/{instance}/set")
+    async def audio_set(instance: str, req: AudioSetReq) -> dict[str, Any]:
+        inst = _check_instance(instance)
+        names = {s.name for s in inst.audio_sources}
+        if req.source not in names:
+            raise HTTPException(
+                400, f"unknown audio source '{req.source}'. Доступны: {sorted(names)}"
+            )
+        await dispatcher.handle(instance, "audio.set", req.source)
+        return {"ok": True, "instance": instance, "source": req.source}
+
+    @app.post("/intercom/{instance}/start")
+    async def intercom_start(instance: str) -> dict[str, Any]:
+        _check_instance(instance)
+        await dispatcher.handle(instance, "intercom.start", "")
+        return {"ok": True, "instance": instance, "intercom": "active"}
+
+    @app.post("/intercom/{instance}/end")
+    async def intercom_end(instance: str) -> dict[str, Any]:
+        _check_instance(instance)
+        await dispatcher.handle(instance, "intercom.end", "")
+        return {"ok": True, "instance": instance, "intercom": "idle"}
+
+    # ─── Snapshot ──────────────────────────────────────────────────
+
+    @app.post(
+        "/snapshot/{instance}",
+        responses={
+            200: {"content": {"image/png": {}}, "description": "PNG snapshot of live grid"},
+            504: {"description": "ffmpeg timeout"},
+        },
+    )
+    async def snapshot(instance: str) -> Response:
+        """Capture single frame от output_rtsp_url. Returns PNG bytes (image/png)."""
+        inst = _check_instance(instance)
+        if not inst.output_rtsp_url:
+            raise HTTPException(400, f"instance '{instance}' has no output_rtsp_url configured")
+
+        proc = await asyncio.create_subprocess_exec(
+            "ffmpeg", "-hide_banner", "-loglevel", "error",
+            "-rtsp_transport", "tcp",
+            "-i", inst.output_rtsp_url,
+            "-frames:v", "1",
+            "-f", "image2pipe", "-c:v", "png", "-",
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        try:
+            png_data, err = await asyncio.wait_for(proc.communicate(), timeout=10)
+        except asyncio.TimeoutError:
+            proc.kill()
+            raise HTTPException(504, "snapshot timeout (ffmpeg >10s)")
+
+        if proc.returncode != 0 or not png_data:
+            err_msg = err.decode(errors="replace")[:300] if err else "no output"
+            log.warning("snapshot.failed", instance=instance, err=err_msg)
+            raise HTTPException(500, f"ffmpeg failed: {err_msg}")
+
+        log.info("snapshot.ok", instance=instance, bytes=len(png_data))
+        return Response(content=png_data, media_type="image/png")
+
     @app.patch("/overlay/{instance}/{overlay_id}")
     async def overlay_update(
         instance: str, overlay_id: str, overlay: Overlay = Body(...)
diff --git a/controller/cuda_grid_controller/mqtt_loop.py b/controller/cuda_grid_controller/mqtt_loop.py
index b2e0d4e..6e83497 100644
--- a/controller/cuda_grid_controller/mqtt_loop.py
+++ b/controller/cuda_grid_controller/mqtt_loop.py
@@ -24,6 +24,7 @@ import aiomqtt
 import structlog
 
 from .config import Config
+from .dynamic_overlays import DynamicRenderer
 from .frigate_bridge import FrigateBridge
 from .ha_discovery import availability_topic, discovery_payloads
 from .state import ControllerState
@@ -41,11 +42,13 @@ class MqttLoop:
         state: ControllerState,
         command_handler: CommandHandler,
         frigate_bridge: FrigateBridge | None = None,
+        dynamic_renderer: DynamicRenderer | None = None,
     ) -> None:
         self.cfg = cfg
         self.state = state
         self.command_handler = command_handler
         self.frigate_bridge = frigate_bridge
+        self.dynamic_renderer = dynamic_renderer
         self._client: aiomqtt.Client | None = None
         self._stop = asyncio.Event()
 
@@ -85,6 +88,11 @@ class MqttLoop:
                         for t in self.frigate_bridge.topics_to_subscribe():
                             await client.subscribe(t, qos=0)
                             log.info("mqtt.frigate.subscribed", topic=t)
+                    # Dynamic overlays MQTT data subscriptions
+                    if self.dynamic_renderer:
+                        for t in self.dynamic_renderer.topics_to_subscribe():
+                            await client.subscribe(t, qos=0)
+                            log.info("mqtt.dynamic.subscribed", topic=t)
 
                     async for msg in client.messages:
                         await self._handle_message(msg)
@@ -126,6 +134,11 @@ class MqttLoop:
             await self.frigate_bridge.handle_message(topic, payload)
             return
 
+        # Dynamic overlays — chart data + chat messages
+        if self.dynamic_renderer:
+            self.dynamic_renderer.handle_message(topic, payload)
+            return
+
         log.warning("mqtt.unknown_topic", topic=topic, payload=payload)
 
     async def publish_state(self, instance: str, scope: str, value: str, retain: bool = True) -> None:
diff --git a/controller/cuda_grid_controller/zmq_client.py b/controller/cuda_grid_controller/zmq_client.py
index 8b51455..018caae 100644
--- a/controller/cuda_grid_controller/zmq_client.py
+++ b/controller/cuda_grid_controller/zmq_client.py
@@ -11,6 +11,8 @@ FFmpeg zmq filter принимает строки формата:
 
 from __future__ import annotations
 
+import asyncio
+
 import structlog
 import zmq
 import zmq.asyncio
@@ -26,6 +28,10 @@ class FFmpegZmqClient:
         self.request_timeout_ms = request_timeout_ms
         self._ctx = zmq.asyncio.Context.instance()
         self._sock: zmq.asyncio.Socket | None = None
+        # REQ socket требует strict send→recv→send→recv pattern. Без lock'а
+        # concurrent send_command (overlay + audio) ломает state в "Operation
+        # cannot be accomplished in current state". Serialize requests.
+        self._lock = asyncio.Lock()
 
     async def connect(self) -> None:
         if self._sock is not None:
@@ -55,17 +61,24 @@ class FFmpegZmqClient:
             cmd_str = f"{cmd_str} '{escaped}'"
 
         log.debug("zmq.send", endpoint=self.endpoint, cmd=cmd_str)
-        try:
-            await self._sock.send_string(cmd_str)
-            reply = await self._sock.recv_string()
-            log.debug("zmq.reply", reply=reply)
-            return reply
-        except zmq.error.Again:
-            log.warning("zmq.timeout", endpoint=self.endpoint, cmd=cmd_str)
-            # Reset REQ socket state — после timeout REQ нельзя re-use
-            self._sock.close(linger=0)
-            self._sock = None
-            raise TimeoutError(f"zmq command timeout: {cmd_str}")
+        async with self._lock:
+            try:
+                await self._sock.send_string(cmd_str)
+                reply = await self._sock.recv_string()
+                log.debug("zmq.reply", reply=reply)
+                return reply
+            except zmq.error.Again:
+                log.warning("zmq.timeout", endpoint=self.endpoint, cmd=cmd_str)
+                self._sock.close(linger=0)
+                self._sock = None
+                raise TimeoutError(f"zmq command timeout: {cmd_str}")
+            except Exception as e:
+                # Любая другая ошибка тоже ломает REQ state — сбрасываем socket
+                log.warning("zmq.error", endpoint=self.endpoint, error=str(e))
+                if self._sock is not None:
+                    self._sock.close(linger=0)
+                    self._sock = None
+                raise
 
     async def close(self) -> None:
         if self._sock is not None: