pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2739-ThereAndBack.ps) >>/Users/jc/w/tmp/Tune-2739-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/ThereAndBack.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_27391.log 285735 Log file, useful mostly for debugging
Coll_27397.log 292760 Log file, useful mostly for debugging
Tune-2739-ThereAndBack.abc 1503 ABC music file with the extracted tune(s)
Tune-2739-ThereAndBack.ps 45934 PostScript
Tune-2739-ThereAndBack.txt 1503 Plain-text file with the extracted tune(s)
Tune-2739-get.log 4850 Log file, useful mostly for debugging
These files should be available for 24 hours.