pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86129-4323.ps) >>/Users/jc/w/tmp/Tune-86129-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR12/4323=Orange_and_Blue-abc2.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-86129-4323.abc 1346 ABC music file with the extracted tune(s)
Tune-86129-4323.ps 41948 PostScript
Tune-86129-4323.txt 1346 Plain-text file with the extracted tune(s)
Tune-86129-get.log 4675 Log file, useful mostly for debugging
These files should be available for 24 hours.