pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-43738-Green_Island-D-32-3.ps) >>/Users/jc/w/tmp/Tune-43738-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ONeills/hornpipe/Green_Island-D-32-3.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-43738-Green_Island-D-32-3.abc 452 ABC music file with the extracted tune(s)
Tune-43738-Green_Island-D-32-3.ps 34975 PostScript
Tune-43738-Green_Island-D-32-3.txt 452 Plain-text file with the extracted tune(s)
Tune-43738-get.log 10245 Log file, useful mostly for debugging
These files should be available for 24 hours.