pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3057-1792_Thompson_24.ps) >>/Users/jc/w/tmp/Tune-3057-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/dfty/1792_Thompson_24.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_30572.log 294165 Log file, useful mostly for debugging
Coll_30579.log 282925 Log file, useful mostly for debugging
Find_30576.log 1479 Log file, useful mostly for debugging
Tune-3057-1792_Thompson_24.abc 11842 ABC music file with the extracted tune(s)
Tune-3057-1792_Thompson_24.ps 141478 PostScript
Tune-3057-1792_Thompson_24.txt 11842 Plain-text file with the extracted tune(s)
Tune-3057-get.log 26810 Log file, useful mostly for debugging
Tune-30577-get.log 5826 Log file, useful mostly for debugging
These files should be available for 24 hours.