Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/15091_Cuddy_clawd_her.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-94940-all.ps) >>/Users/jc/w/tmp/Tune-94940-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/15091_Cuddy_clawd_her.abc/all

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_94940.log 147318 Log file, useful mostly for debugging
Tune-94940-all.abc 173 ABC music file with the extracted tune(s)
Tune-94940-all.ps 6 PostScript
Tune-94940-all.txt 173 Plain-text file with the extracted tune(s)
Tune-94940-get.log 4088 Log file, useful mostly for debugging
These files should be available for 24 hours.