Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1783/dim.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-507-dim.ps) >>/Users/jc/w/tmp/Tune-507-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1783/dim.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-507-dim.abc 140 ABC music file with the extracted tune(s)
Tune-507-dim.ps 6 PostScript
Tune-507-dim.txt 140 Plain-text file with the extracted tune(s)
Tune-507-get.log 3904 Log file, useful mostly for debugging
Tune-50707-get.log 4965 Log file, useful mostly for debugging
Tune-5072-get.log 3286 Log file, useful mostly for debugging
Tune-50720-get.log 3222 Log file, useful mostly for debugging
Tune-50729-get.log 3312 Log file, useful mostly for debugging
Tune-50741-get.log 5168 Log file, useful mostly for debugging
Tune-50759-get.log 3366 Log file, useful mostly for debugging
Tune-50764-Gow-CSR-abc2.abc 149 ABC music file with the extracted tune(s)
Tune-50764-Gow-CSR-abc2.ps 6 PostScript
Tune-50764-Gow-CSR-abc2.txt 149 Plain-text file with the extracted tune(s)
Tune-50764-get.log 4033 Log file, useful mostly for debugging
Tune-5077-get.log 3520 Log file, useful mostly for debugging
Tune-50799-get.log 5174 Log file, useful mostly for debugging
These files should be available for 24 hours.