Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/_/sett.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7877-sett.ps) >>/Users/jc/w/tmp/Tune-7877-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/_/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_78770.log 287140 Log file, useful mostly for debugging
Coll_78773.log 957021 Log file, useful mostly for debugging
Coll_78778.log 981591 Log file, useful mostly for debugging
Coll_78779.log 291355 Log file, useful mostly for debugging
Tune-7877-get.log 8138 Log file, useful mostly for debugging
Tune-7877-sett.abc 138 ABC music file with the extracted tune(s)
Tune-7877-sett.ps 6 PostScript
Tune-7877-sett.txt 138 Plain-text file with the extracted tune(s)
Tune-78770-get.log 4796 Log file, useful mostly for debugging
Tune-78773-get.log 12080 Log file, useful mostly for debugging
Tune-78775-get.log 5330 Log file, useful mostly for debugging
These files should be available for 24 hours.