Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/GM/Don_Jumpedo.abc/1750"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1886-1750.ps) >>/Users/jc/w/tmp/Tune-1886-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/GM/Don_Jumpedo.abc/1750

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_18868.log 319456 Log file, useful mostly for debugging
Coll_18869.log 261851 Log file, useful mostly for debugging
Form_18867.log 847 Log file, useful mostly for debugging
Tune-1886-1750.abc 151 ABC music file with the extracted tune(s)
Tune-1886-1750.ps 6 PostScript
Tune-1886-1750.txt 151 Plain-text file with the extracted tune(s)
Tune-1886-get.log 14875 Log file, useful mostly for debugging
Tune-18860-get.log 5330 Log file, useful mostly for debugging
Tune-18863-31583_Kitty_of_Coleraine.abc 581 ABC music file with the extracted tune(s)
Tune-18863-31583_Kitty_of_Coleraine.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-18863-31583_Kitty_of_Coleraine.ps 33173 PostScript
Tune-18863-31583_Kitty_of_Coleraine.txt 581 Plain-text file with the extracted tune(s)
Tune-18863-get.log 5739 Log file, useful mostly for debugging
Tune-18864-get.log 5353 Log file, useful mostly for debugging
Tune-18868-get.log 3734 Log file, useful mostly for debugging
These files should be available for 24 hours.