pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5368-10291_SPEED_THE_PLOUGH.ps) >>/Users/jc/w/tmp/Tune-5368-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/10291_SPEED_THE_PLOUGH.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_5368.log 266066 Log file, useful mostly for debugging
Coll_53681.log 261851 Log file, useful mostly for debugging
Coll_53682.log 260446 Log file, useful mostly for debugging
Coll_53687.log 263256 Log file, useful mostly for debugging
Coll_53688.log 329291 Log file, useful mostly for debugging
Form_53686.log 850 Log file, useful mostly for debugging
Form_53687.log 1654 Log file, useful mostly for debugging
Tune-5368-10291_SPEED_THE_PLOUGH.abc 895 ABC music file with the extracted tune(s)
Tune-5368-10291_SPEED_THE_PLOUGH.ps 43692 PostScript
Tune-5368-10291_SPEED_THE_PLOUGH.txt 895 Plain-text file with the extracted tune(s)
Tune-5368-get.log 4711 Log file, useful mostly for debugging
These files should be available for 24 hours.