Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1805/endo.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9457-endo.ps) >>/Users/jc/w/tmp/Tune-9457-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1805/endo.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_9457.log 391110 Log file, useful mostly for debugging
Coll_94576.log 364415 Log file, useful mostly for debugging
Find_94575.log 1502 Log file, useful mostly for debugging
Tune-9457-endo.abc 141 ABC music file with the extracted tune(s)
Tune-9457-endo.ps 6 PostScript
Tune-9457-endo.txt 141 Plain-text file with the extracted tune(s)
Tune-9457-get.log 3940 Log file, useful mostly for debugging
Tune-94573-get.log 4448 Log file, useful mostly for debugging
Tune-94574-get.log 3836 Log file, useful mostly for debugging
Tune-94578-get.log 10775 Log file, useful mostly for debugging
These files should be available for 24 hours.