pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3132-Gow-CSR4-abc2.ps) >>/Users/jc/w/tmp/Tune-3132-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow-CSR4-abc2.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_31321.log 454335 Log file, useful mostly for debugging
Tune-3132-Gow-CSR4-abc2.abc 107205 ABC music file with the extracted tune(s)
Tune-3132-Gow-CSR4-abc2.ps 1119055 PostScript
Tune-3132-Gow-CSR4-abc2.txt 107205 Plain-text file with the extracted tune(s)
Tune-3132-get.log 79031 Log file, useful mostly for debugging
Tune-31324-get.log 3814 Log file, useful mostly for debugging
These files should be available for 24 hours.