Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Longman.abc/1770"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3010-1770.ps) >>/Users/jc/w/tmp/Tune-3010-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/Longman.abc/1770

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_30100.log 129904 Log file, useful mostly for debugging
Coll_30101.log 153124 Log file, useful mostly for debugging
Coll_30109.log 253421 Log file, useful mostly for debugging
Tune-3010-1770.abc 149 ABC music file with the extracted tune(s)
Tune-3010-1770.ps 6 PostScript
Tune-3010-1770.txt 149 Plain-text file with the extracted tune(s)
Tune-3010-get.log 12508 Log file, useful mostly for debugging
Tune-30103-get.log 1378 Log file, useful mostly for debugging
Tune-30104-get.log 186063 Log file, useful mostly for debugging
Tune-30105-get.log 4911 Log file, useful mostly for debugging
Tune-30107-get.log 3055 Log file, useful mostly for debugging
Tune-30109-get.log 4115 Log file, useful mostly for debugging
These files should be available for 24 hours.