pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2067-Gow-CSR3-abc1.ps) >>/Users/jc/w/tmp/Tune-2067-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow-CSR3-abc1.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_20677.log 600455 Log file, useful mostly for debugging
Coll_20679.log 302594 Log file, useful mostly for debugging
Tune-2067-Gow-CSR3-abc1.abc 97803 ABC music file with the extracted tune(s)
Tune-2067-Gow-CSR3-abc1.ps 1051230 PostScript
Tune-2067-Gow-CSR3-abc1.txt 97803 Plain-text file with the extracted tune(s)
Tune-2067-get.log 67072 Log file, useful mostly for debugging
Tune-20673-get.log 4371 Log file, useful mostly for debugging
Tune-20678-get.log 4112 Log file, useful mostly for debugging
These files should be available for 24 hours.