pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-91348-___.ps) >>/Users/jc/w/tmp/Tune-91348-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/polka/Polka:Heel_and_Toe-DG-32-2.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
Tune-91348-___.abc 295 ABC music file with the extracted tune(s)
Tune-91348-___.ps 32773 PostScript
Tune-91348-___.txt 295 Plain-text file with the extracted tune(s)
Tune-91348-get.log 5249 Log file, useful mostly for debugging
These files should be available for 24 hours.