pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-83561-4182-Duncan_Gray-abc1.ps) >>/Users/jc/w/tmp/Tune-83561-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR12/4182-Duncan_Gray-abc1.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-83561-4182-Duncan_Gray-abc1.abc 1446 ABC music file with the extracted tune(s)
Tune-83561-4182-Duncan_Gray-abc1.ps 46116 PostScript
Tune-83561-4182-Duncan_Gray-abc1.txt 1446 Plain-text file with the extracted tune(s)
Tune-83561-get.log 4695 Log file, useful mostly for debugging
These files should be available for 24 hours.