pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-57839-_.ps) >>/Users/jc/w/tmp/Tune-57839-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/shottish/_.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_57839.log 489460 Log file, useful mostly for debugging
Tune-57839-_.abc 168 ABC music file with the extracted tune(s)
Tune-57839-_.ps 30581 PostScript
Tune-57839-_.txt 168 Plain-text file with the extracted tune(s)
Tune-57839-get.log 7220 Log file, useful mostly for debugging
These files should be available for 24 hours.