diff --git a/src/platform/types/MediaDevices.ts b/src/platform/types/MediaDevices.ts
index 85f64f95..93418a66 100644
--- a/src/platform/types/MediaDevices.ts
+++ b/src/platform/types/MediaDevices.ts
@@ -20,11 +20,14 @@ export interface MediaDevices {
     // to assign to a video element, we downcast to WrappedTrack and use the stream property. 
     getMediaTracks(audio: true | MediaDeviceInfo, video: boolean | MediaDeviceInfo): Promise<Stream>;
     getScreenShareTrack(): Promise<Stream | undefined>;
+    createVolumeMeasurer(stream: Stream): VolumeMeasurer;
 }
 
+
 export interface Stream {
-    readonly audioTrack: AudioTrack | undefined;
-    readonly videoTrack: Track | undefined;
+    getTracks(): ReadonlyArray<Track>;
+    getAudioTracks(): ReadonlyArray<Track>;
+    getVideoTracks(): ReadonlyArray<Track>;
     readonly id: string;
     clone(): Stream;
 }
@@ -38,15 +41,11 @@ export interface Track {
     readonly kind: TrackKind;
     readonly label: string;
     readonly id: string;
-    readonly settings: MediaTrackSettings;
-    get enabled(): boolean;
-    set enabled(value: boolean);
-    equals(track: Track): boolean;
+    enabled: boolean;
+    // getSettings(): MediaTrackSettings;
     stop(): void;
 }
 
-export interface AudioTrack extends Track {
-    // TODO: how to emit updates on this?
-    get isSpeaking(): boolean;
+export interface VolumeMeasurer {
+    
 }
-
diff --git a/src/platform/web/dom/MediaDevices.ts b/src/platform/web/dom/MediaDevices.ts
index a04fca91..4eb92259 100644
--- a/src/platform/web/dom/MediaDevices.ts
+++ b/src/platform/web/dom/MediaDevices.ts
@@ -98,6 +98,7 @@ export class StreamWrapper implements Stream {
     }
 
     update(track: MediaStreamTrack): TrackWrapper | undefined {
+        //console.trace("Stream.update " + JSON.stringify({id: track.id, vid: this.videoTrack?.id, aid: this.audioTrack?.id}));
         if (track.kind === "video") {
             if (!this.videoTrack || track.id !== this.videoTrack.track.id) {
                 this.videoTrack = new TrackWrapper(track, this.stream, track.id);