pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7415-KeppochsRant0.ps) >>/Users/jc/w/tmp/Tune-7415-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/KeppochsRant0.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
Form_74150.log 0 Log file, useful mostly for debugging
Form_74155.log 787 Log file, useful mostly for debugging
Form_74159.log 806 Log file, useful mostly for debugging
Tune-7415-KeppochsRant0.abc 498 ABC music file with the extracted tune(s)
Tune-7415-KeppochsRant0.ps 37698 PostScript
Tune-7415-KeppochsRant0.txt 498 Plain-text file with the extracted tune(s)
Tune-7415-get.log 7445 Log file, useful mostly for debugging
Tune-74152-get.log 4091 Log file, useful mostly for debugging
Tune-74157-get.log 4031 Log file, useful mostly for debugging
Tune-74159-get.log 4621 Log file, useful mostly for debugging
These files should be available for 24 hours.