Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21262_the_Secret_stream.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6637-all.ps) >>/Users/jc/w/tmp/Tune-6637-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21262_the_Secret_stream.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_66373.log 263256 Log file, useful mostly for debugging
Coll_66379.log 529322 Log file, useful mostly for debugging
Find_66376.log 1503 Log file, useful mostly for debugging
Form_66370.log 851 Log file, useful mostly for debugging
Form_66372.log 836 Log file, useful mostly for debugging
Form_66374.log 828 Log file, useful mostly for debugging
Form_66378.log 836 Log file, useful mostly for debugging
Form_66379.log 831 Log file, useful mostly for debugging
List66371.log 164 Log file, useful mostly for debugging
Tune-6637-all.abc 175 ABC music file with the extracted tune(s)
Tune-6637-all.ps 6 PostScript
Tune-6637-all.txt 175 Plain-text file with the extracted tune(s)
Tune-6637-get.log 4083 Log file, useful mostly for debugging
Tune-66371-get.log 7052 Log file, useful mostly for debugging
Tune-66373-get.log 3574 Log file, useful mostly for debugging
Tune-66379-get.log 5635 Log file, useful mostly for debugging
These files should be available for 24 hours.