pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-99443-Modes-hexa.ps) >>/Users/jc/w/tmp/Tune-99443-get.log 2>&1" returned status 256
http://www.campin.me.uk/Music/Modes/Modes-hexa.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_99443.log 130707 Log file, useful mostly for debugging
Tune-99443-Modes-hexa.abc 36159 ABC music file with the extracted tune(s)
Tune-99443-Modes-hexa.ps 233778 PostScript
Tune-99443-Modes-hexa.txt 36159 Plain-text file with the extracted tune(s)
Tune-99443-get.log 62871 Log file, useful mostly for debugging
These files should be available for 24 hours.