pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-37406-Modes-multiple.ps) >>/Users/jc/w/tmp/Tune-37406-get.log 2>&1" returned status 256
http://www.campin.me.uk/Music/Modes/Modes-multiple.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-37406-Modes-multiple.abc 22322 ABC music file with the extracted tune(s)
Tune-37406-Modes-multiple.ps 251023 PostScript
Tune-37406-Modes-multiple.txt 22322 Plain-text file with the extracted tune(s)
Tune-37406-get.log 32684 Log file, useful mostly for debugging
These files should be available for 24 hours.