Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book33/Gow-CSR4-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9594-Gow-CSR4-abc1.ps) >>/Users/jc/w/tmp/Tune-9594-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book33/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_95945.log 288545 Log file, useful mostly for debugging
Coll_95946.log 288546 Log file, useful mostly for debugging
Tune-9594-Gow-CSR4-abc1.abc 152 ABC music file with the extracted tune(s)
Tune-9594-Gow-CSR4-abc1.ps 6 PostScript
Tune-9594-Gow-CSR4-abc1.txt 152 Plain-text file with the extracted tune(s)
Tune-9594-get.log 9998 Log file, useful mostly for debugging
Tune-95940-BotCDaSS.abc 147 ABC music file with the extracted tune(s)
Tune-95940-BotCDaSS.ps 6 PostScript
Tune-95940-BotCDaSS.txt 147 Plain-text file with the extracted tune(s)
Tune-95940-get.log 10056 Log file, useful mostly for debugging
Tune-95941-get.log 4322 Log file, useful mostly for debugging
Tune-95944-get.log 4040 Log file, useful mostly for debugging
Tune-95948-JohnFrench.abc 149 ABC music file with the extracted tune(s)
Tune-95948-JohnFrench.ps 6 PostScript
Tune-95948-JohnFrench.txt 149 Plain-text file with the extracted tune(s)
Tune-95948-get.log 4005 Log file, useful mostly for debugging
These files should be available for 24 hours.