Implement review changes 2

config.js

     // Enables support for opus-red (redundancy for Opus).
     // enableOpusRed: false,
 
-    // Enables HD audio quality (but also disables echo cancellation, noise suppression and AGC).
-    // enableHdAudio: false,
+    // Specify audio quality stereo and opusMaxAverageBitrate values, both necessary in order to enable HD audio.
+    // Beware, by doing so, you are disabling echo cancellation, noise suppression and AGC.
+    // audioQuality: {
+    //     stereo: false,
+    //     opusMaxAverageBitrate: null // Value to fit the 6000 to 510000 range.
+    // }
 
     // Video
 

react/features/base/config/configWhitelist.js

     'abTesting',
     'analytics.disabled',
     'audioLevelsInterval',
+    'audioQuality',
     'apiLogLevels',
     'avgRtpStatsN',
     'backgroundAlpha',
     'e2eping',
     'enableDisplayNameInStats',
     'enableEmailInStats',
-    'enableHdAudio',
     'enableIceRestart',
     'enableInsecureRoomNameWarning',
     'enableLayerSuspension',

react/features/base/config/reducer.js

     }
 };
 
-/**
- * Options that enable stereo and HD audio if the {@code enableHdAudio} config option is set.
- */
-const hdAudioOptions = {
-    disableAP: true,
-    enableNoAudioDetection: false,
-    enableNoisyMicDetection: false,
-    enableTalkWhileMuted: false,
-    opusMaxAverageBitrate: 510000,
-    stereo: true
-};
-
 ReducerRegistry.register('features/base/config', (state = _getInitialState(), action) => {
     switch (action.type) {
     case UPDATE_CONFIG:
 
     // eslint-disable-next-line no-param-reassign
     config = _translateLegacyConfig(config);
+    const hdAudioOptions = {};
+    const { audioQuality } = config;
+
+    if (audioQuality?.stereo && audioQuality?.opusMaxAverageBitrate) {
+        const { opusMaxAverageBitrate, stereo } = audioQuality;
+
+        Object.assign(hdAudioOptions, {
+            disableAP: true,
+            enableNoAudioDetection: false,
+            enableNoisyMicDetection: false,
+            enableTalkWhileMuted: false,
+            opusMaxAverageBitrate,
+            stereo
+        });
+    }
 
     const newState = _.merge(
         {},
         config,
-        config.enableHdAudio ? hdAudioOptions : {},
+        hdAudioOptions,
         { error: undefined },
 
         // The config of _getInitialState() is meant to override the config