pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2451-Vals01.ps) >>/Users/jc/w/tmp/Tune-2451-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Contra/Vals01.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_24511.log 419210 Log file, useful mostly for debugging
Coll_24513.log 308215 Log file, useful mostly for debugging
Tune-2451-Vals01.abc 2519 ABC music file with the extracted tune(s)
Tune-2451-Vals01.ps 51048 PostScript
Tune-2451-Vals01.txt 2519 Plain-text file with the extracted tune(s)
Tune-2451-get.log 10285 Log file, useful mostly for debugging
These files should be available for 24 hours.