pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-99437-Bourree_23.ps) >>/Users/jc/w/tmp/Tune-99437-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/bourree/Bourree_23.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_99437.log 363010 Log file, useful mostly for debugging
Tune-99437-Bourree_23.abc 277 ABC music file with the extracted tune(s)
Tune-99437-Bourree_23.ps 33553 PostScript
Tune-99437-Bourree_23.txt 277 Plain-text file with the extracted tune(s)
Tune-99437-get.log 4418 Log file, useful mostly for debugging
These files should be available for 24 hours.