pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5778-proto.ps) >>/Users/jc/w/tmp/Tune-5778-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CDfNH1783/proto.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_57786.log 312283 Log file, useful mostly for debugging
Tune-5778-get.log 4412 Log file, useful mostly for debugging
Tune-5778-proto.abc 255 ABC music file with the extracted tune(s)
Tune-5778-proto.ps 30600 PostScript
Tune-5778-proto.txt 255 Plain-text file with the extracted tune(s)
Tune-57780-get.log 1405 Log file, useful mostly for debugging
These files should be available for 24 hours.