Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21312_Shanbuie.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6107-all.ps) >>/Users/jc/w/tmp/Tune-6107-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21312_Shanbuie.abc/all

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Form_61074.log 948 Log file, useful mostly for debugging
Tune-6107-all.abc 166 ABC music file with the extracted tune(s)
Tune-6107-all.ps 6 PostScript
Tune-6107-all.txt 166 Plain-text file with the extracted tune(s)
Tune-6107-get.log 4031 Log file, useful mostly for debugging
Tune-61071-get.log 1394 Log file, useful mostly for debugging
Tune-61075-get.log 1424 Log file, useful mostly for debugging
Tune-61079-get.log 1401 Log file, useful mostly for debugging
These files should be available for 24 hours.