Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/20591_Port_Gordon.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8516-all.ps) >>/Users/jc/w/tmp/Tune-8516-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/20591_Port_Gordon.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_85167.log 270282 Log file, useful mostly for debugging
Coll_85169.log 522297 Log file, useful mostly for debugging
Find_85165.log 1573 Log file, useful mostly for debugging
Form_8516.log 837 Log file, useful mostly for debugging
Form_85161.log 826 Log file, useful mostly for debugging
Form_85162.log 974 Log file, useful mostly for debugging
Form_85168.log 954 Log file, useful mostly for debugging
Tune-8516-all.abc 169 ABC music file with the extracted tune(s)
Tune-8516-all.ps 6 PostScript
Tune-8516-all.txt 169 Plain-text file with the extracted tune(s)
Tune-8516-get.log 4045 Log file, useful mostly for debugging
Tune-85168-21672_MARGARET_MACDONALD-001.svg 25738 Scalable Vector Graphics format
Tune-85168-21672_MARGARET_MACDONALD.abc 779 ABC music file with the extracted tune(s)
Tune-85168-21672_MARGARET_MACDONALD.txt 779 Plain-text file with the extracted tune(s)
Tune-85168-get.log 9934 Log file, useful mostly for debugging
These files should be available for 24 hours.