Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1811.abc/blank.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5232-blank.ps) >>/Users/jc/w/tmp/Tune-5232-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1811.abc/blank.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_52327.log 690811 Log file, useful mostly for debugging
Coll_52328.log 155816 Log file, useful mostly for debugging
Tune-5232-blank.abc 146 ABC music file with the extracted tune(s)
Tune-5232-blank.ps 6 PostScript
Tune-5232-blank.txt 146 Plain-text file with the extracted tune(s)
Tune-5232-get.log 3987 Log file, useful mostly for debugging
Tune-52320-get.log 1407 Log file, useful mostly for debugging
Tune-52323-get.log 9710 Log file, useful mostly for debugging
These files should be available for 24 hours.