Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/abc2/Kohlers1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9728-Kohlers1.ps) >>/Users/jc/w/tmp/Tune-9728-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/abc2/Kohlers1.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-9728-Kohlers1.abc 145 ABC music file with the extracted tune(s)
Tune-9728-Kohlers1.ps 6 PostScript
Tune-9728-Kohlers1.txt 145 Plain-text file with the extracted tune(s)
Tune-9728-get.log 4024 Log file, useful mostly for debugging
Tune-97284-Jean_Henry_dAnglebert_PdC2.abc 163 ABC music file with the extracted tune(s)
Tune-97284-Jean_Henry_dAnglebert_PdC2.ps 6 PostScript
Tune-97284-Jean_Henry_dAnglebert_PdC2.txt 163 Plain-text file with the extracted tune(s)
Tune-97284-get.log 4450 Log file, useful mostly for debugging
Tune-97285-Glen2.abc 142 ABC music file with the extracted tune(s)
Tune-97285-Glen2.txt 142 Plain-text file with the extracted tune(s)
Tune-97285-get.log 3098 Log file, useful mostly for debugging
These files should be available for 24 hours.