Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Sets/cresc.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8493-cresc.ps) >>/Users/jc/w/tmp/Tune-8493-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Sets/cresc.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-8493-cresc.abc 142 ABC music file with the extracted tune(s)
Tune-8493-cresc.ps 6 PostScript
Tune-8493-cresc.txt 142 Plain-text file with the extracted tune(s)
Tune-8493-get.log 3957 Log file, useful mostly for debugging
Tune-84930-get.log 5070 Log file, useful mostly for debugging
Tune-84932-Swallow.abc 427 ABC music file with the extracted tune(s)
Tune-84932-Swallow.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-84932-Swallow.ps 34331 PostScript
Tune-84932-Swallow.txt 427 Plain-text file with the extracted tune(s)
Tune-84932-get.log 5184 Log file, useful mostly for debugging
Tune-84934-get.log 10650 Log file, useful mostly for debugging
Tune-84937-1212_Central_Will_Shine-001.svg 27873 Scalable Vector Graphics format
Tune-84937-1212_Central_Will_Shine.abc 1469 ABC music file with the extracted tune(s)
Tune-84937-1212_Central_Will_Shine.txt 1469 Plain-text file with the extracted tune(s)
Tune-84937-get.log 5295 Log file, useful mostly for debugging
These files should be available for 24 hours.