Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MacNab01/JamesOswald_CPC-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2969-JamesOswald_CPC-abc2.ps) >>/Users/jc/w/tmp/Tune-2969-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MacNab01/JamesOswald_CPC-abc2.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_29690.log 287140 Log file, useful mostly for debugging
Coll_29695.log 275900 Log file, useful mostly for debugging
Coll_29697.log 412830 Log file, useful mostly for debugging
Tune-2969-JamesOswald_CPC-abc2.abc 161 ABC music file with the extracted tune(s)
Tune-2969-JamesOswald_CPC-abc2.ps 6 PostScript
Tune-2969-JamesOswald_CPC-abc2.txt 161 Plain-text file with the extracted tune(s)
Tune-2969-get.log 4298 Log file, useful mostly for debugging
Tune-29694-get.log 4305 Log file, useful mostly for debugging
Tune-29697-FARNE_Anonymous2.abc 155 ABC music file with the extracted tune(s)
Tune-29697-FARNE_Anonymous2.ps 6 PostScript
Tune-29697-FARNE_Anonymous2.txt 155 Plain-text file with the extracted tune(s)
Tune-29697-get.log 4129 Log file, useful mostly for debugging
These files should be available for 24 hours.