Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1750/proto.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1350-proto.ps) >>/Users/jc/w/tmp/Tune-1350-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1750/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
Tune-1350-get.log 3963 Log file, useful mostly for debugging
Tune-1350-proto.abc 142 ABC music file with the extracted tune(s)
Tune-1350-proto.ps 6 PostScript
Tune-1350-proto.txt 142 Plain-text file with the extracted tune(s)
Tune-13500-JohnJohnson_ChoiceCollectionVol8-V1.abc 173 ABC music file with the extracted tune(s)
Tune-13500-JohnJohnson_ChoiceCollectionVol8-V1.txt 173 Plain-text file with the extracted tune(s)
Tune-13500-get.log 12053 Log file, useful mostly for debugging
Tune-13502-get.log 8371 Log file, useful mostly for debugging
Tune-13503-get.log 5165 Log file, useful mostly for debugging
Tune-13508-get.log 5462 Log file, useful mostly for debugging
These files should be available for 24 hours.