Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ERM/cont.abc/save"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4779-save.ps) >>/Users/jc/w/tmp/Tune-4779-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ERM/cont.abc/save

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_47799.log 539160 Log file, useful mostly for debugging
Form_4779.log 957 Log file, useful mostly for debugging
Form_47793.log 832 Log file, useful mostly for debugging
Form_47794.log 854 Log file, useful mostly for debugging
Form_47797.log 830 Log file, useful mostly for debugging
List47796.log 162 Log file, useful mostly for debugging
Tune-4779-get.log 3916 Log file, useful mostly for debugging
Tune-4779-save.abc 145 ABC music file with the extracted tune(s)
Tune-4779-save.ps 6 PostScript
Tune-4779-save.txt 145 Plain-text file with the extracted tune(s)
Tune-47794-014_Englishman_in_Paris-001.svg 17826 Scalable Vector Graphics format
Tune-47794-014_Englishman_in_Paris.abc 842 ABC music file with the extracted tune(s)
Tune-47794-014_Englishman_in_Paris.txt 842 Plain-text file with the extracted tune(s)
Tune-47794-get.log 9717 Log file, useful mostly for debugging
Tune-47796-get.log 3642 Log file, useful mostly for debugging
Tune-47797-get.log 7549 Log file, useful mostly for debugging
These files should be available for 24 hours.