I wanted to let you know that I discovered a free audio library for Android that offers a ton of functionality (like the ability to speed up/slow down audio tracks or change the pitch). The same company offers a USB Audio out library that is much better than what Google offers, but that library has to be licensed. I have sent the company emails to see what the licensing fees are. If the fees are reasonable, then I will be able to offer integrated support for USB audio out, which would fix all the problems you are encountering. I'll update this thread when I get more information.
Mike
Mike