A new release of abcsound is available in the usual place:
http://www.kneuro.net/abcsound/abcsound.zip
This one can produce pch in addition to cps values. To do that, use:
instr Guitar [p1=1:p4=pch]
to get pch output for p4 of the "Guitar" instrument, or use
instr Guitar [p1=1:p4=pitch]
to get cps output.
Have fun,
-- JK
Why not just 'cps"...
OK, it's a quivial tribble... er... trivial quibble... but why use "p4=pitch", rather than simply "p4=cps", so the mnemonics would be consistent? (If you later add a "p4=oct" option, won't that be even more confusing?)
Historical quirk
I started using "pitch" at the beginning, and didn't know about cpspch and friends (or anything about pitch class sets) at the time... I'll add "cps" as a synonym for "pitch" in a future release. (Soonish.)