pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7004-20540_.ps) >>/Users/jc/w/tmp/Tune-7004-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MoF/20540_.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-7004-20540_.abc 33 ABC music file with the extracted tune(s)
Tune-7004-20540_.ps 6 PostScript
Tune-7004-20540_.txt 33 Plain-text file with the extracted tune(s)
Tune-7004-get.log 3836 Log file, useful mostly for debugging
Tune-70041-get.log 1376 Log file, useful mostly for debugging
Tune-70045-get.log 1382 Log file, useful mostly for debugging
These files should be available for 24 hours.