Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/20031_Walley_Honey.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2212-all.ps) >>/Users/jc/w/tmp/Tune-2212-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/20031_Walley_Honey.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_22121.log 264661 Log file, useful mostly for debugging
Coll_22129.log 263256 Log file, useful mostly for debugging
Form_22124.log 954 Log file, useful mostly for debugging
Tune-2212-all.abc 170 ABC music file with the extracted tune(s)
Tune-2212-all.ps 6 PostScript
Tune-2212-all.txt 170 Plain-text file with the extracted tune(s)
Tune-2212-get.log 4051 Log file, useful mostly for debugging
Tune-22120-get.log 1375 Log file, useful mostly for debugging
Tune-22125-get.log 4658 Log file, useful mostly for debugging
Tune-22128-get.log 45153 Log file, useful mostly for debugging
These files should be available for 24 hours.