Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21040_.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2440-all.ps) >>/Users/jc/w/tmp/Tune-2440-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21040_.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_24400.log 264661 Log file, useful mostly for debugging
Coll_24401.log 261851 Log file, useful mostly for debugging
Coll_24404.log 1323463 Log file, useful mostly for debugging
Coll_24405.log 513346 Log file, useful mostly for debugging
Form_2440.log 1047 Log file, useful mostly for debugging
Form_24402.log 1948 Log file, useful mostly for debugging
Form_24405.log 1032 Log file, useful mostly for debugging
Tune-2440-all.abc 158 ABC music file with the extracted tune(s)
Tune-2440-all.ps 6 PostScript
Tune-2440-all.txt 158 Plain-text file with the extracted tune(s)
Tune-2440-get.log 8161 Log file, useful mostly for debugging
Tune-24406-get.log 9805 Log file, useful mostly for debugging
Tune-24407-get.log 13531 Log file, useful mostly for debugging
These files should be available for 24 hours.