[Bug 12349] DSOUND_MixInBuffer Assertion `dsb->buf_mixpos + len <= dsb->tmp_buffer_len' failed

http://bugs.winehq.org/show_bug.cgi?id=12349

--- Comment #12 from Maarten Lankhorst   2008-06-19 00:07:17 ---
The error is the first clue. For whatever reason the alignment is wrong,
causing horrible problems. Could it be that the secondary buffer has an
alignment of 2 (mono buffer) and the primary of 4?

Also you want to figure out what the exact values of tmp_buffer_len, nAlign,
and buf_mixpos are. They will give some clues what exactly is going on.