pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6634-Bourree_16.ps) >>/Users/jc/w/tmp/Tune-6634-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/bourree/Bourree_16.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_66342.log 506320 Log file, useful mostly for debugging
Coll_66343.log 652440 Log file, useful mostly for debugging
Tune-6634-Bourree_16.abc 280 ABC music file with the extracted tune(s)
Tune-6634-Bourree_16.ps 33196 PostScript
Tune-6634-Bourree_16.txt 280 Plain-text file with the extracted tune(s)
Tune-6634-get.log 4441 Log file, useful mostly for debugging
These files should be available for 24 hours.