pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2763-accw01.ps) >>/Users/jc/w/tmp/Tune-2763-get.log 2>&1" returned status 256
http://www.alfwarnock.info/alfs/abc/accw01.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_27634.log 134942 Log file, useful mostly for debugging
Coll_27638.log 136152 Log file, useful mostly for debugging
Form_2763.log 1671 Log file, useful mostly for debugging
Tune-2763-accw01.abc 255 ABC music file with the extracted tune(s)
Tune-2763-accw01.ps 35007 PostScript
Tune-2763-accw01.txt 255 Plain-text file with the extracted tune(s)
Tune-2763-get.log 4305 Log file, useful mostly for debugging
Tune-27635-get.log 7667 Log file, useful mostly for debugging
These files should be available for 24 hours.