how to make TTS voice louder

[fedeerbes]

Hi guys, this module is awsome, but i wonder if exist any chance to make the voice louder, like Directions of google maps o the voice of WAZE.

i new on android, i tried to use Equalizer y BassBoost with a audioSessionId from audiomanager and pass this to params on speak method. But without luck

public void speak(String utterance, ReadableMap params, Promise promise) {
     if(notReady(promise)) return;
     **int audioSessionId = audioManager.generateAudioSessionId();**
     if(ducking) {
         int amResult;
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             ...
         } else {
             amResult = audioManager.requestAudioFocus(afChangeListener, AudioManager.STREAM_MUSIC,
             AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK);

             Log.d(TAG, "REACT NATIVE TTS: audioSessionId audio session ID: " + audioSessionId);
             mEqualizer = new Equalizer(0, **audioSessionId**);
             mBassBoost = new BassBoost(0, **audioSessionId**);
             mBassBoost.setStrength((short) ((short) 1000 / 100 * 90));
             mBassBoost.setEnabled(true);
             short bands = mEqualizer.getNumberOfBands();
             final short minEQLevel = mEqualizer.getBandLevelRange()[0];
             final short maxEQLevel = mEqualizer.getBandLevelRange()[1];
             for (short i = 0; i < bands; i++) {
                 final short band = i;
                 Log.d(TAG, "REACT NATIVE TTS: bandLevel: " + mEqualizer.getBandLevel(band));
                 mEqualizer.setBandLevel(band, (short) maxEQLevel);
             }
             mEqualizer.setEnabled(true);
         }

         if(amResult != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
             promise.reject("Android AudioManager error, failed to request audio focus");
             return;
         }
     }

     String utteranceId = Integer.toString(utterance.hashCode());

     int speakResult = speak(utterance, utteranceId, params, **audioSessionId**);
     if(speakResult == TextToSpeech.SUCCESS) {
         promise.resolve(utteranceId);
     } else {
         promise.reject("unable to play");
     }
 }

private int speak(String utterance, String utteranceId, ReadableMap inputParams, int **audioSessionId**) {
        ...
        if (Build.VERSION.SDK_INT >= 21) {
            Bundle params = new Bundle();
            params.putInt(TextToSpeech.Engine.KEY_PARAM_STREAM, audioStreamType);
            **params.putInt(TextToSpeech.Engine.KEY_PARAM_SESSION_ID, audioSessionId);**
            params.putFloat(TextToSpeech.Engine.KEY_PARAM_VOLUME, volume);
            params.putFloat(TextToSpeech.Engine.KEY_PARAM_PAN, pan);
            return tts.speak(utterance, TextToSpeech.QUEUE_ADD, params, utteranceId);
        } else {
            HashMap<String, String> params = new HashMap();
            params.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, utteranceId);
            **params.put(TextToSpeech.Engine.KEY_PARAM_SESSION_ID, String.valueOf(audioSessionId));**
            params.put(TextToSpeech.Engine.KEY_PARAM_STREAM, String.valueOf(audioStreamType));
            params.put(TextToSpeech.Engine.KEY_PARAM_VOLUME, String.valueOf(volume));
            params.put(TextToSpeech.Engine.KEY_PARAM_PAN, String.valueOf(pan));
            return tts.speak(utterance, TextToSpeech.QUEUE_ADD, params);
        }
    }

[omatrot]

I have the same problem, the voice volume is too low, which makes it difficult to use outside