MidiScope/Application/src/main/java/com/example/android/common/midi/synth/SynthEngine.java [230:245]:
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    public void noteOn(int channel, int noteIndex, int velocity) {
        if (velocity == 0) {
            noteOff(channel, noteIndex, velocity);
        } else {
            mVoices.remove(noteIndex);
            SynthVoice voice;
            if (mFreeVoices.size() > 0) {
                voice = mFreeVoices.remove(mFreeVoices.size() - 1);
            } else {
                voice = createVoice(mProgram);
            }
            voice.setFrequencyScaler(mFrequencyScaler);
            voice.noteOn(noteIndex, velocity);
            mVoices.put(noteIndex, voice);
        }
    }
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MidiSynth/Application/src/main/java/com/example/android/common/midi/synth/SynthEngine.java [230:245]:
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    public void noteOn(int channel, int noteIndex, int velocity) {
        if (velocity == 0) {
            noteOff(channel, noteIndex, velocity);
        } else {
            mVoices.remove(noteIndex);
            SynthVoice voice;
            if (mFreeVoices.size() > 0) {
                voice = mFreeVoices.remove(mFreeVoices.size() - 1);
            } else {
                voice = createVoice(mProgram);
            }
            voice.setFrequencyScaler(mFrequencyScaler);
            voice.noteOn(noteIndex, velocity);
            mVoices.put(noteIndex, voice);
        }
    }
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