pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-94186-MMM1.ps) >>/Users/jc/w/tmp/Tune-94186-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MMM1.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_94186.log 277304 Log file, useful mostly for debugging
Tune-94186-MMM1.abc 28454 ABC music file with the extracted tune(s)
Tune-94186-MMM1.ps 277378 PostScript
Tune-94186-MMM1.txt 28454 Plain-text file with the extracted tune(s)
Tune-94186-get.log 25220 Log file, useful mostly for debugging
These files should be available for 24 hours.