pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4787-Open_Window-D-16-4.ps) >>/Users/jc/w/tmp/Tune-4787-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ONeills/march/Open_Window-D-16-4.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-4787-Open_Window-D-16-4.abc 510 ABC music file with the extracted tune(s)
Tune-4787-Open_Window-D-16-4.ps 34491 PostScript
Tune-4787-Open_Window-D-16-4.txt 510 Plain-text file with the extracted tune(s)
Tune-4787-get.log 10232 Log file, useful mostly for debugging
Tune-47871-get.log 1385 Log file, useful mostly for debugging
Tune-47872-get.log 9782 Log file, useful mostly for debugging
Tune-47876-get.log 8887 Log file, useful mostly for debugging
Tune-47877-get.log 6305 Log file, useful mostly for debugging
These files should be available for 24 hours.