Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/B/CDfNH1783.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4980-CDfNH1783.ps) >>/Users/jc/w/tmp/Tune-4980-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/B/CDfNH1783.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_49802.log 527917 Log file, useful mostly for debugging
Coll_49803.log 263256 Log file, useful mostly for debugging
Coll_49804.log 263256 Log file, useful mostly for debugging
Form_49807.log 837 Log file, useful mostly for debugging
Tune-4980-CDfNH1783.abc 143 ABC music file with the extracted tune(s)
Tune-4980-CDfNH1783.ps 6 PostScript
Tune-4980-CDfNH1783.txt 143 Plain-text file with the extracted tune(s)
Tune-4980-get.log 4025 Log file, useful mostly for debugging
Tune-49800-get.log 31494 Log file, useful mostly for debugging
Tune-49803-get.log 4029 Log file, useful mostly for debugging
Tune-49805-get.log 10634 Log file, useful mostly for debugging
Tune-49806-get.log 4797 Log file, useful mostly for debugging
Tune-49807-get.log 5032 Log file, useful mostly for debugging
Tune-49808-get.log 5444 Log file, useful mostly for debugging
Tune-49809-get.log 9817 Log file, useful mostly for debugging
These files should be available for 24 hours.