pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-73541-new.ps) >>/Users/jc/w/tmp/Tune-73541-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Contra/new.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-73541-get.log 6911 Log file, useful mostly for debugging
Tune-73541-new.abc 3322 ABC music file with the extracted tune(s)
Tune-73541-new.ps 66855 PostScript
Tune-73541-new.txt 3322 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.