Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1784/CTftF.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4844-CTftF.ps) >>/Users/jc/w/tmp/Tune-4844-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1784/CTftF.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-4844-CTftF.abc 142 ABC music file with the extracted tune(s)
Tune-4844-CTftF.ps 6 PostScript
Tune-4844-CTftF.txt 142 Plain-text file with the extracted tune(s)
Tune-4844-get.log 3959 Log file, useful mostly for debugging
Tune-48441-get.log 7923 Log file, useful mostly for debugging
Tune-48442-get.log 8792 Log file, useful mostly for debugging
Tune-48443-get.log 4593 Log file, useful mostly for debugging
Tune-48445-get.log 4539 Log file, useful mostly for debugging
Tune-48446-get.log 5758 Log file, useful mostly for debugging
Tune-48447-get.log 6446 Log file, useful mostly for debugging
These files should be available for 24 hours.