Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/13009-Title-abc1.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4668-all.ps) >>/Users/jc/w/tmp/Tune-4668-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/13009-Title-abc1.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_46681.log 261851 Log file, useful mostly for debugging
Coll_46683.log 301192 Log file, useful mostly for debugging
Coll_46689.log 134420 Log file, useful mostly for debugging
Form_46687.log 1653 Log file, useful mostly for debugging
Tune-4668-all.abc 168 ABC music file with the extracted tune(s)
Tune-4668-all.ps 6 PostScript
Tune-4668-all.txt 168 Plain-text file with the extracted tune(s)
Tune-4668-get.log 4041 Log file, useful mostly for debugging
Tune-46681-get.log 9055 Log file, useful mostly for debugging
Tune-46686-get.log 5680 Log file, useful mostly for debugging
Tune-46689-get.log 11219 Log file, useful mostly for debugging
These files should be available for 24 hours.