Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/12Minuets12Dances/sett.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6339-sett.ps) >>/Users/jc/w/tmp/Tune-6339-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/12Minuets12Dances/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
Coll_63390.log 502106 Log file, useful mostly for debugging
Coll_63398.log 647342 Log file, useful mostly for debugging
Form_6339.log 838 Log file, useful mostly for debugging
Form_63398.log 1846 Log file, useful mostly for debugging
Tune-6339-get.log 4020 Log file, useful mostly for debugging
Tune-6339-sett.abc 154 ABC music file with the extracted tune(s)
Tune-6339-sett.ps 6 PostScript
Tune-6339-sett.txt 154 Plain-text file with the extracted tune(s)
Tune-63391-get.log 3383 Log file, useful mostly for debugging
Tune-63392-get.log 4655 Log file, useful mostly for debugging
Tune-63395-get.log 3224 Log file, useful mostly for debugging
These files should be available for 24 hours.