pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-29275-Shot_5.ps) >>/Users/jc/w/tmp/Tune-29275-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/shottish/Shot_5.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-29275-Shot_5.abc 512 ABC music file with the extracted tune(s)
Tune-29275-Shot_5.ps 34244 PostScript
Tune-29275-Shot_5.txt 512 Plain-text file with the extracted tune(s)
Tune-29275-get.log 4391 Log file, useful mostly for debugging
These files should be available for 24 hours.