pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6517-Rufty_tufty.ps) >>/Users/jc/w/tmp/Tune-6517-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/Rufty_tufty.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_65170.log 276409 Log file, useful mostly for debugging
Coll_65179.log 454211 Log file, useful mostly for debugging
Form_65175.log 1068 Log file, useful mostly for debugging
Tune-6517-Rufty_tufty.abc 386 ABC music file with the extracted tune(s)
Tune-6517-Rufty_tufty.ps 32447 PostScript
Tune-6517-Rufty_tufty.txt 386 Plain-text file with the extracted tune(s)
Tune-6517-get.log 5720 Log file, useful mostly for debugging
Tune-65179-get.log 5466 Log file, useful mostly for debugging
These files should be available for 24 hours.