pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-55346-JacksonsRollingJig.ps) >>/Users/jc/w/tmp/Tune-55346-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ryan-cole/Tunes/JacksonsRollingJig.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_55346.log 137644 Log file, useful mostly for debugging
Tune-55346-JacksonsRollingJig.abc 491 ABC music file with the extracted tune(s)
Tune-55346-JacksonsRollingJig.ps 35193 PostScript
Tune-55346-JacksonsRollingJig.txt 491 Plain-text file with the extracted tune(s)
Tune-55346-get.log 4716 Log file, useful mostly for debugging
These files should be available for 24 hours.