pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-57692-MissBarkersHornpipe.ps) >>/Users/jc/w/tmp/Tune-57692-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ryan-cole/Tunes/MissBarkersHornpipe.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-57692-MissBarkersHornpipe.abc 371 ABC music file with the extracted tune(s)
Tune-57692-MissBarkersHornpipe.ps 35579 PostScript
Tune-57692-MissBarkersHornpipe.txt 371 Plain-text file with the extracted tune(s)
Tune-57692-get.log 4743 Log file, useful mostly for debugging
These files should be available for 24 hours.