pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3254-JamesJohnson_ScotsMusicalMuseumV4-V1.ps) >>/Users/jc/w/tmp/Tune-3254-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesJohnson_ScotsMusicalMuseumV4-V1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_3254.log 287139 Log file, useful mostly for debugging
Coll_32543.log 451525 Log file, useful mostly for debugging
Tune-3254-JamesJohnson_ScotsMusicalMuseumV4-V1.abc 3269 ABC music file with the extracted tune(s)
Tune-3254-JamesJohnson_ScotsMusicalMuseumV4-V1.ps 40453 PostScript
Tune-3254-JamesJohnson_ScotsMusicalMuseumV4-V1.txt 3269 Plain-text file with the extracted tune(s)
Tune-3254-get.log 10475 Log file, useful mostly for debugging
Tune-32545-get.log 7281 Log file, useful mostly for debugging
These files should be available for 24 hours.