pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5475-test2.ps) >>/Users/jc/w/tmp/Tune-5475-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/test2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-5475-get.log 4927 Log file, useful mostly for debugging
Tune-5475-test2.abc 7744 ABC music file with the extracted tune(s)
Tune-5475-test2.ps 104872 PostScript
Tune-5475-test2.txt 7744 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.