Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book10/blank.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7748-blank.ps) >>/Users/jc/w/tmp/Tune-7748-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book10/blank.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_77480.log 287140 Log file, useful mostly for debugging
Coll_77489.log 289951 Log file, useful mostly for debugging
Tune-7748-blank.abc 144 ABC music file with the extracted tune(s)
Tune-7748-blank.ps 6 PostScript
Tune-7748-blank.txt 144 Plain-text file with the extracted tune(s)
Tune-7748-get.log 3973 Log file, useful mostly for debugging
Tune-77480-get.log 11008 Log file, useful mostly for debugging
Tune-77482-get.log 1255 Log file, useful mostly for debugging
Tune-77485-get.log 1382 Log file, useful mostly for debugging
Tune-77486-get.log 6628 Log file, useful mostly for debugging
These files should be available for 24 hours.