Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/MacNab02/_.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8301-_.ps) >>/Users/jc/w/tmp/Tune-8301-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/MacNab02/_.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_83019.log 417812 Log file, useful mostly for debugging
Find_8301.log 1465 Log file, useful mostly for debugging
List83019.log 168 Log file, useful mostly for debugging
Tune-8301-_.abc 142 ABC music file with the extracted tune(s)
Tune-8301-_.ps 6 PostScript
Tune-8301-_.txt 142 Plain-text file with the extracted tune(s)
Tune-8301-get.log 3903 Log file, useful mostly for debugging
These files should be available for 24 hours.