pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1603-10671_Air_Allegro.ps) >>/Users/jc/w/tmp/Tune-1603-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MoF/10671_Air_Allegro.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_1603.log 160815 Log file, useful mostly for debugging
Form_16034.log 1028 Log file, useful mostly for debugging
Tune-1603-10671_Air_Allegro.abc 624 ABC music file with the extracted tune(s)
Tune-1603-10671_Air_Allegro.ps 37334 PostScript
Tune-1603-10671_Air_Allegro.txt 624 Plain-text file with the extracted tune(s)
Tune-1603-get.log 5298 Log file, useful mostly for debugging
Tune-16034-get.log 1313 Log file, useful mostly for debugging
These files should be available for 24 hours.