Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/AdvancedSD/Gow-CSR1-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4781-Gow-CSR1-abc1.ps) >>/Users/jc/w/tmp/Tune-4781-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/AdvancedSD/Gow-CSR1-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
Sess-47814.log 28292 Log file, useful mostly for debugging
Tune-4781-Gow-CSR1-abc1.abc 156 ABC music file with the extracted tune(s)
Tune-4781-Gow-CSR1-abc1.ps 6 PostScript
Tune-4781-Gow-CSR1-abc1.txt 156 Plain-text file with the extracted tune(s)
Tune-4781-get.log 4158 Log file, useful mostly for debugging
Tune-47811-get.log 4920 Log file, useful mostly for debugging
Tune-47814-get.log 3195 Log file, useful mostly for debugging
Tune-47816-get.log 1471 Log file, useful mostly for debugging
These files should be available for 24 hours.