Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Gow/fmt/CSR-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1756-CSR-abc1.ps) >>/Users/jc/w/tmp/Tune-1756-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/fmt/CSR-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_17560.log 469610 Log file, useful mostly for debugging
Coll_17565.log 455611 Log file, useful mostly for debugging
Find_17560.log 1662 Log file, useful mostly for debugging
Tune-1756-CSR-abc1.abc 148 ABC music file with the extracted tune(s)
Tune-1756-CSR-abc1.ps 6 PostScript
Tune-1756-CSR-abc1.txt 148 Plain-text file with the extracted tune(s)
Tune-1756-get.log 4040 Log file, useful mostly for debugging
Tune-17565-get.log 1423 Log file, useful mostly for debugging
Tune-17569-get.log 5042 Log file, useful mostly for debugging
These files should be available for 24 hours.