pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-77536-v12.ps) >>/Users/jc/w/tmp/Tune-77536-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/dfty/v12.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_77536.log 1028 Log file, useful mostly for debugging
Tune-77536-get.log 3802 Log file, useful mostly for debugging
Tune-77536-v12.abc 206 ABC music file with the extracted tune(s)
Tune-77536-v12.ps 6 PostScript
Tune-77536-v12.txt 206 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.