Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/misc/Kohlers3.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8163-Kohlers3.ps) >>/Users/jc/w/tmp/Tune-8163-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/misc/Kohlers3.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-8163-Kohlers3.abc 145 ABC music file with the extracted tune(s)
Tune-8163-Kohlers3.ps 6 PostScript
Tune-8163-Kohlers3.txt 145 Plain-text file with the extracted tune(s)
Tune-8163-get.log 4026 Log file, useful mostly for debugging
Tune-81630-get.log 5241 Log file, useful mostly for debugging
Tune-81634-get.log 1386 Log file, useful mostly for debugging
Tune-81635-Gow-CSR1-abc2.abc 152 ABC music file with the extracted tune(s)
Tune-81635-Gow-CSR1-abc2.txt 152 Plain-text file with the extracted tune(s)
Tune-81635-get.log 3252 Log file, useful mostly for debugging
Tune-81638-get.log 5153 Log file, useful mostly for debugging
These files should be available for 24 hours.