pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6172-JohnTreat_GftF2.ps) >>/Users/jc/w/tmp/Tune-6172-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JohnTreat_GftF2.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_6172.log 282924 Log file, useful mostly for debugging
Coll_61727.log 891809 Log file, useful mostly for debugging
Tune-6172-JohnTreat_GftF2.abc 85418 ABC music file with the extracted tune(s)
Tune-6172-JohnTreat_GftF2.ps 555928 PostScript
Tune-6172-JohnTreat_GftF2.txt 85418 Plain-text file with the extracted tune(s)
Tune-6172-get.log 68716 Log file, useful mostly for debugging
Tune-61725-get.log 4394 Log file, useful mostly for debugging
Tune-61729-get.log 3520 Log file, useful mostly for debugging
These files should be available for 24 hours.