pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-26957-Farm_Hornpipe-D-32-4.ps) >>/Users/jc/w/tmp/Tune-26957-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ONeills/hornpipe/Farm_Hornpipe-D-32-4.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_26957.log 1093910 Log file, useful mostly for debugging
Tune-26957-Farm_Hornpipe-D-32-4.abc 564 ABC music file with the extracted tune(s)
Tune-26957-Farm_Hornpipe-D-32-4.ps 37880 PostScript
Tune-26957-Farm_Hornpipe-D-32-4.txt 564 Plain-text file with the extracted tune(s)
Tune-26957-get.log 4759 Log file, useful mostly for debugging
These files should be available for 24 hours.