Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/slipjig/sett.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8558-sett.ps) >>/Users/jc/w/tmp/Tune-8558-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/slipjig/sett.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-8558-get.log 3958 Log file, useful mostly for debugging
Tune-8558-sett.abc 144 ABC music file with the extracted tune(s)
Tune-8558-sett.ps 6 PostScript
Tune-8558-sett.txt 144 Plain-text file with the extracted tune(s)
Tune-85581-get.log 1528 Log file, useful mostly for debugging
Tune-85583-4180_the_Fox_Chased.abc 519 ABC music file with the extracted tune(s)
Tune-85583-4180_the_Fox_Chased.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-85583-4180_the_Fox_Chased.ps 36346 PostScript
Tune-85583-4180_the_Fox_Chased.txt 519 Plain-text file with the extracted tune(s)
Tune-85583-get.log 5545 Log file, useful mostly for debugging
Tune-85587-get.log 1550 Log file, useful mostly for debugging
These files should be available for 24 hours.