> There's an sbpro driver for 2nd Edition on Charles Forsyth's Plan 9 software
> page.  It may be a SMOP to port it to 3rd Edition.

Here's an update to the 3rd edition version of /sys/src/9/port/devaudio.c for
sbpro support.  It's been found to work on a real sbpro and at least two
impostors; it doesn't work on the Thinkpad T21.

I think my resampling of sound data in b8to16() and b16to8() isn't quite right.
Would somebody like to comment?

-- Richard