pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-27850-1770.ps) >>/Users/jc/w/tmp/Tune-27850-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/dfty/1770.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_27850.log 292760 Log file, useful mostly for debugging
Tune-27850-1770.abc 8253 ABC music file with the extracted tune(s)
Tune-27850-1770.ps 103870 PostScript
Tune-27850-1770.txt 8253 Plain-text file with the extracted tune(s)
Tune-27850-get.log 16002 Log file, useful mostly for debugging
These files should be available for 24 hours.