pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-90739-new.ps) >>/Users/jc/w/tmp/Tune-90739-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Quebec/new.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_90739.log 271684 Log file, useful mostly for debugging
Tune-90739-get.log 4270 Log file, useful mostly for debugging
Tune-90739-new.abc 838 ABC music file with the extracted tune(s)
Tune-90739-new.ps 39799 PostScript
Tune-90739-new.txt 838 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.