pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-94221-20012.ps) >>/Users/jc/w/tmp/Tune-94221-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/20012=Maid_in_Bedlam-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_94221.log 918219 Log file, useful mostly for debugging
Tune-94221-20012.abc 548 ABC music file with the extracted tune(s)
Tune-94221-20012.ps 34488 PostScript
Tune-94221-20012.txt 548 Plain-text file with the extracted tune(s)
Tune-94221-get.log 4731 Log file, useful mostly for debugging
These files should be available for 24 hours.