Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Tweed2/proto.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4137-proto.ps) >>/Users/jc/w/tmp/Tune-4137-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Tweed2/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
Form_4137.log 877 Log file, useful mostly for debugging
Form_41373.log 891 Log file, useful mostly for debugging
Form_41374.log 892 Log file, useful mostly for debugging
Tune-4137-get.log 3967 Log file, useful mostly for debugging
Tune-4137-proto.abc 144 ABC music file with the extracted tune(s)
Tune-4137-proto.ps 6 PostScript
Tune-4137-proto.txt 144 Plain-text file with the extracted tune(s)
Tune-41370-get.log 4895 Log file, useful mostly for debugging
Tune-41373-get.log 4983 Log file, useful mostly for debugging
Tune-41375-get.log 3252 Log file, useful mostly for debugging
Tune-41377-CTftF.abc 144 ABC music file with the extracted tune(s)
Tune-41377-CTftF.txt 144 Plain-text file with the extracted tune(s)
Tune-41377-get.log 3104 Log file, useful mostly for debugging
These files should be available for 24 hours.