pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18656-21511_THE_THREE_AS_HORNPIPE.ps) >>/Users/jc/w/tmp/Tune-18656-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/21511_THE_THREE_AS_HORNPIPE.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_18656.log 588332 Log file, useful mostly for debugging
Tune-18656-21511_THE_THREE_AS_HORNPIPE.abc 911 ABC music file with the extracted tune(s)
Tune-18656-21511_THE_THREE_AS_HORNPIPE.ps 40002 PostScript
Tune-18656-21511_THE_THREE_AS_HORNPIPE.txt 911 Plain-text file with the extracted tune(s)
Tune-18656-get.log 4866 Log file, useful mostly for debugging
These files should be available for 24 hours.