pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-66759-Jigs_Xmas.ps) >>/Users/jc/w/tmp/Tune-66759-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/Jigs_Xmas.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_66759.log 285735 Log file, useful mostly for debugging
Tune-66759-Jigs_Xmas.abc 3616 ABC music file with the extracted tune(s)
Tune-66759-Jigs_Xmas.ps 58949 PostScript
Tune-66759-Jigs_Xmas.txt 3616 Plain-text file with the extracted tune(s)
Tune-66759-get.log 4482 Log file, useful mostly for debugging
These files should be available for 24 hours.