AWT2 version 0.08.9 brings full support of multichannel wave files (3, 4, 5, …, 12 channels are no problem now).
Additionally, several unpleasant bugs were fixed in GUI tool for Windows, Linux and Mac OS as well as in command line tools. In particular, the tools were not able to operate with file paths containing spaces. Now it should be OK under any OS.
FFmpeg static binary has been added into Mac OS package for more convenience.