Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/MacNab02/cresc.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2995-cresc.ps) >>/Users/jc/w/tmp/Tune-2995-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/MacNab02/cresc.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_2995.log 944 Log file, useful mostly for debugging
Tune-2995-cresc.abc 146 ABC music file with the extracted tune(s)
Tune-2995-cresc.ps 6 PostScript
Tune-2995-cresc.txt 146 Plain-text file with the extracted tune(s)
Tune-2995-get.log 9379 Log file, useful mostly for debugging
Tune-29951-get.log 4296 Log file, useful mostly for debugging
Tune-29952-get.log 3526 Log file, useful mostly for debugging
Tune-29954-get.log 1481 Log file, useful mostly for debugging
Tune-29958-get.log 1484 Log file, useful mostly for debugging
These files should be available for 24 hours.