Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Pioneer/sett.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5667-sett.ps) >>/Users/jc/w/tmp/Tune-5667-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Pioneer/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_56673.log 270812 Log file, useful mostly for debugging
Find_56670.log 1932 Log file, useful mostly for debugging
Tune-5667-get.log 3956 Log file, useful mostly for debugging
Tune-5667-sett.abc 144 ABC music file with the extracted tune(s)
Tune-5667-sett.ps 6 PostScript
Tune-5667-sett.txt 144 Plain-text file with the extracted tune(s)
Tune-56673-2243_a_Glass_of_Potheen.abc 447 ABC music file with the extracted tune(s)
Tune-56673-2243_a_Glass_of_Potheen.pdf 12933 Portable Data Format
Tune-56673-2243_a_Glass_of_Potheen.ps 34084 PostScript
Tune-56673-2243_a_Glass_of_Potheen.txt 447 Plain-text file with the extracted tune(s)
Tune-56673-get.log 5669 Log file, useful mostly for debugging
These files should be available for 24 hours.