pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-35407-471_Black_and_Grey.ps) >>/Users/jc/w/tmp/Tune-35407-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BotCDaSS/471_Black_and_Grey.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_35407.log 472410 Log file, useful mostly for debugging
Tune-35407-471_Black_and_Grey.abc 736 ABC music file with the extracted tune(s)
Tune-35407-471_Black_and_Grey.ps 33624 PostScript
Tune-35407-471_Black_and_Grey.txt 736 Plain-text file with the extracted tune(s)
Tune-35407-get.log 9898 Log file, useful mostly for debugging
These files should be available for 24 hours.