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I'm reading a wav-file to a byte array using this method (shown below) . Now that I have it stored inside my byte array, I want to change the sounds volume. private byte[] getAudioFileData(final String filePath) { byte[] data = null; try { final ByteArrayOutputStream baout = new ByteArrayOutputStream(); final File file = new File(filePath); final AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file); byte[] buffer = new byte[4096]; int c; while ((c = audioInputStream.read(buffer, 0, buffer.length)) != -1) { baout.write(buffer, 0, c); } audioInputStream.close(); baout.close(); data = baout.toByteArray(); } catch (Exception e) { e.printStackTrace(); } return data; } Edit: Per request some info on the audio format: PCM_SIGNED 44100.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian From physics-class I remembered that you can change the amplitude of a sine-wave by multiplying the sine-value with a number between 0 and 1. Edit: Updated code for 16-bit samples: private byte[] adjustVolume(byte[] audioSamples, double volume) { byte[] array = new byte[audioSamples.length]; for (int i = 0; i < array.length; i+=2) { // convert byte pair to int int audioSample = (int) ((audioSamples[i+1] & 0xff) << 8) | (audioSamples[i] & 0xff); audioSample = (int) (audioSample * volume); // convert back array[i] = (byte) audioSample; array[i+1] = (byte) (audioSample >> 8); } return array; } The sound is heavily distorted if I multiply audioSample with volume . If I don't and compare both arrays with Arrays.compare(array, audioSample) I can conclude that the byte-array is being conv

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