pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-27168-new_CM.ps) >>/Users/jc/w/tmp/Tune-27168-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/contra/new_CM.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-27168-get.log 15387 Log file, useful mostly for debugging
Tune-27168-new_CM.abc 7055 ABC music file with the extracted tune(s)
Tune-27168-new_CM.ps 86288 PostScript
Tune-27168-new_CM.txt 7055 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.