Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/20981_the_Lucky_Minute.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8088-all.ps) >>/Users/jc/w/tmp/Tune-8088-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/20981_the_Lucky_Minute.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_80884.log 1000759 Log file, useful mostly for debugging
Coll_80886.log 468386 Log file, useful mostly for debugging
Tune-8088-all.abc 174 ABC music file with the extracted tune(s)
Tune-8088-all.ps 6 PostScript
Tune-8088-all.txt 174 Plain-text file with the extracted tune(s)
Tune-8088-get.log 4073 Log file, useful mostly for debugging
Tune-80885-get.log 7731 Log file, useful mostly for debugging
Tune-80886-get.log 4127 Log file, useful mostly for debugging
Tune-80888-get.log 10843 Log file, useful mostly for debugging
These files should be available for 24 hours.