Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/slipjig/cont.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6449-cont.ps) >>/Users/jc/w/tmp/Tune-6449-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/slipjig/cont.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_64496.log 641811 Log file, useful mostly for debugging
Find_64490.log 1781 Log file, useful mostly for debugging
Tune-6449-cont.abc 144 ABC music file with the extracted tune(s)
Tune-6449-cont.ps 6 PostScript
Tune-6449-cont.txt 144 Plain-text file with the extracted tune(s)
Tune-6449-get.log 3958 Log file, useful mostly for debugging
Tune-64495-get.log 5489 Log file, useful mostly for debugging
Tune-64499-get.log 1295 Log file, useful mostly for debugging
These files should be available for 24 hours.