I need a tone only in left or right. I will try to override playSound in a child class and set volume differently, but it would be great if you can add this option.

No matter if you pause the thread, or set pause intervals. The tone will stop in a few seconds.
OneTimeBuffer is working well.

Thanks for this lib.

I was wondering if there is a way to increase/decrease volume or frequency during playback.

So far I manage to do this using ContinuousBuzzer and setting buzzer.setPausePeriodSeconds(1);

Then on button click event I increase the volume (or frequency) like this buzzer.setToneFreqInHz(freq+=30);

Which works but I experience clipping issues every 1 seconds (which is kind of expected I guess since the playback stops and restarts every 1 secs)

So I guess my question comes down to whether I can control volume or frequency in a smooth continuous sound without clipping issues or interruptions.

Player state is modified both on the main thread and the background player thread. A specific example where this is a problem: calling #play ends up starting a thread that modifies the audioTrack instance field, and calling #stop modifies the same instance field on whatever thread it's called from (probably the main thread). This will result in NPEs if you play / stop with the correct timing.

I want to use this library in my project but can't because I don't want to share my source codes but according to LGPL I should. Is it possible to make it Apache 2.0?

I get no sound from this or other examples on the web using AudioTrack to play back samples. I see this error in the logcat but I cannot make any sense of what needs to be changed.

12-09 17:09:28.451 25540 25575 W AudioTrack: Use of stream types is deprecated for operations other than volume control
12-09 17:09:28.452 25540 25575 W AudioTrack: See the documentation of AudioTrack() for what to use instead with android.media.AudioAttributes to qualify your playback use case

I've had a look at the below Android developer documentation page and I still have no idea:

https://developer.android.com/reference/android/media/AudioTrack#AudioTrack(android.media.AudioAttributes,%20android.media.AudioFormat,%20int,%20int,%20int)

Hi Maddie. We are looking for developer to make similar library for Android you made but with larger set or functional. Would you be interested to work on short term project?