* Improve the midisyn layer a little.
* Add a driver for the Yamaha OPL[23] FM synths.
The opl driver is not finished yet; it sounds pretty awful.
For some strange reason I cannot get any FM sound from my SB64 cards,
but a regular SB16 works fine.
* Use the new trigger_{in,out}put interface.
* Allow the play and record channels to have different encodings (but the
same sample rate).
* Play u-law and a-law as 16-bit data. (This may not work yet...)
needs some testing, but it seems to produce sound. The driver was written
by me, but since I don't have the hardware the debugging and testing was
done by Andreas Gustafsson <gson@araneus.fi>, Chuck Cranor
<chuck@maria.wustl.edu>, and Phil Nelson <phil@cs.wwu.edu>. Thanks.
