pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-11634-waltz.ps) >>/Users/jc/w/tmp/Tune-11634-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Quebec/waltz.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-11634-get.log 22834 Log file, useful mostly for debugging
Tune-11634-waltz.abc 18358 ABC music file with the extracted tune(s)
Tune-11634-waltz.ps 198853 PostScript
Tune-11634-waltz.txt 18358 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.