pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6803-2012_Honest_Duncan.ps) >>/Users/jc/w/tmp/Tune-6803-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/2012_Honest_Duncan.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_68030.log 130551 Log file, useful mostly for debugging
Form_68033.log 1083 Log file, useful mostly for debugging
Tune-6803-2012_Honest_Duncan.abc 1125 ABC music file with the extracted tune(s)
Tune-6803-2012_Honest_Duncan.ps 43330 PostScript
Tune-6803-2012_Honest_Duncan.txt 1125 Plain-text file with the extracted tune(s)
Tune-6803-get.log 4594 Log file, useful mostly for debugging
These files should be available for 24 hours.