Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1803/Kohlers.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7419-Kohlers.ps) >>/Users/jc/w/tmp/Tune-7419-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1803/Kohlers.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-7419-Kohlers.abc 144 ABC music file with the extracted tune(s)
Tune-7419-Kohlers.ps 6 PostScript
Tune-7419-Kohlers.txt 144 Plain-text file with the extracted tune(s)
Tune-7419-get.log 4001 Log file, useful mostly for debugging
Tune-74190-get.log 5435 Log file, useful mostly for debugging
Tune-74192-24FavouriteDances_1783_Straight.abc 167 ABC music file with the extracted tune(s)
Tune-74192-24FavouriteDances_1783_Straight.txt 167 Plain-text file with the extracted tune(s)
Tune-74192-get.log 3556 Log file, useful mostly for debugging
Tune-74195-get.log 1392 Log file, useful mostly for debugging
Tune-74198-get.log 1394 Log file, useful mostly for debugging
These files should be available for 24 hours.