pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3519-JamesJohnson_ScotsMusicalMuseumV5-V2.ps) >>/Users/jc/w/tmp/Tune-3519-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesJohnson_ScotsMusicalMuseumV5-V2.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_3519.log 585000 Log file, useful mostly for debugging
Coll_35190.log 139581 Log file, useful mostly for debugging
Coll_35193.log 242180 Log file, useful mostly for debugging
Tune-3519-JamesJohnson_ScotsMusicalMuseumV5-V2.abc 25760 ABC music file with the extracted tune(s)
Tune-3519-JamesJohnson_ScotsMusicalMuseumV5-V2.ps 180932 PostScript
Tune-3519-JamesJohnson_ScotsMusicalMuseumV5-V2.txt 25760 Plain-text file with the extracted tune(s)
Tune-3519-get.log 12247 Log file, useful mostly for debugging
Tune-35192-get.log 5540 Log file, useful mostly for debugging
These files should be available for 24 hours.