Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21412_the_Heither_Tops.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6408-all.ps) >>/Users/jc/w/tmp/Tune-6408-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/21412_the_Heither_Tops.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_64080.log 263256 Log file, useful mostly for debugging
Coll_64084.log 137644 Log file, useful mostly for debugging
Coll_64086.log 260446 Log file, useful mostly for debugging
Form_64084.log 832 Log file, useful mostly for debugging
Form_64087.log 2777 Log file, useful mostly for debugging
Tune-6408-all.abc 174 ABC music file with the extracted tune(s)
Tune-6408-all.ps 6 PostScript
Tune-6408-all.txt 174 Plain-text file with the extracted tune(s)
Tune-6408-get.log 4075 Log file, useful mostly for debugging
Tune-64084-get.log 3633 Log file, useful mostly for debugging
Tune-64088-21161_THE_FLYING_DUTCHMAN-001.svg 29943 Scalable Vector Graphics format
Tune-64088-21161_THE_FLYING_DUTCHMAN.abc 678 ABC music file with the extracted tune(s)
Tune-64088-21161_THE_FLYING_DUTCHMAN.txt 678 Plain-text file with the extracted tune(s)
Tune-64088-get.log 4474 Log file, useful mostly for debugging
These files should be available for 24 hours.