pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6880-Hawk.ps) >>/Users/jc/w/tmp/Tune-6880-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/Hawk.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_68800.log 280115 Log file, useful mostly for debugging
Coll_68803.log 285735 Log file, useful mostly for debugging
Tune-6880-Hawk.abc 1230 ABC music file with the extracted tune(s)
Tune-6880-Hawk.ps 45744 PostScript
Tune-6880-Hawk.txt 1230 Plain-text file with the extracted tune(s)
Tune-6880-get.log 4171 Log file, useful mostly for debugging
Tune-68801-get.log 1396 Log file, useful mostly for debugging
Tune-68805-get.log 1340 Log file, useful mostly for debugging
These files should be available for 24 hours.