pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4432-931_Touchstone.ps) >>/Users/jc/w/tmp/Tune-4432-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1780/Thompson/931_Touchstone.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_4432.log 288545 Log file, useful mostly for debugging
Coll_44323.log 294165 Log file, useful mostly for debugging
Coll_44324.log 288545 Log file, useful mostly for debugging
Coll_44326.log 273090 Log file, useful mostly for debugging
Tune-4432-931_Touchstone.abc 929 ABC music file with the extracted tune(s)
Tune-4432-931_Touchstone.ps 34861 PostScript
Tune-4432-931_Touchstone.txt 929 Plain-text file with the extracted tune(s)
Tune-4432-get.log 4560 Log file, useful mostly for debugging
These files should be available for 24 hours.