Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book19/Gow-CSR4-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2214-Gow-CSR4-abc1.ps) >>/Users/jc/w/tmp/Tune-2214-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book19/Gow-CSR4-abc1.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_22147.log 1173470 Log file, useful mostly for debugging
Tune-2214-Gow-CSR4-abc1.abc 152 ABC music file with the extracted tune(s)
Tune-2214-Gow-CSR4-abc1.ps 6 PostScript
Tune-2214-Gow-CSR4-abc1.txt 152 Plain-text file with the extracted tune(s)
Tune-2214-get.log 4143 Log file, useful mostly for debugging
Tune-22140-get.log 1554 Log file, useful mostly for debugging
Tune-22144-get.log 1444 Log file, useful mostly for debugging
Tune-22148-get.log 1598 Log file, useful mostly for debugging
These files should be available for 24 hours.