pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9395-m.ps) >>/Users/jc/w/tmp/Tune-9395-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Contra/m.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_93950.log 462769 Log file, useful mostly for debugging
Coll_93955.log 368630 Log file, useful mostly for debugging
Tune-9395-get.log 3721 Log file, useful mostly for debugging
Tune-9395-m.abc 201 ABC music file with the extracted tune(s)
Tune-9395-m.ps 30616 PostScript
Tune-9395-m.txt 201 Plain-text file with the extracted tune(s)
Tune-93950-get.log 10540 Log file, useful mostly for debugging
Tune-93957-get.log 5408 Log file, useful mostly for debugging
These files should be available for 24 hours.