pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-88284-21_la_Chasse.ps) >>/Users/jc/w/tmp/Tune-88284-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1770/Longman_Cotillons/21_la_Chasse.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-88284-21_la_Chasse.abc 1785 ABC music file with the extracted tune(s)
Tune-88284-21_la_Chasse.ps 39862 PostScript
Tune-88284-21_la_Chasse.txt 1785 Plain-text file with the extracted tune(s)
Tune-88284-get.log 4699 Log file, useful mostly for debugging
These files should be available for 24 hours.