Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book43/CDfNH1783.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9254-CDfNH1783.ps) >>/Users/jc/w/tmp/Tune-9254-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book43/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
Tune-9254-CDfNH1783.abc 148 ABC music file with the extracted tune(s)
Tune-9254-CDfNH1783.ps 6 PostScript
Tune-9254-CDfNH1783.txt 148 Plain-text file with the extracted tune(s)
Tune-9254-get.log 4057 Log file, useful mostly for debugging
Tune-92540-Kerr_MM4-V1.abc 150 ABC music file with the extracted tune(s)
Tune-92540-Kerr_MM4-V1.pdf 2217 Portable Data Format
Tune-92540-Kerr_MM4-V1.ps 6 PostScript
Tune-92540-Kerr_MM4-V1.txt 150 Plain-text file with the extracted tune(s)
Tune-92540-get.log 4919 Log file, useful mostly for debugging
Tune-92541-get.log 4189 Log file, useful mostly for debugging
Tune-92543-get.log 101029 Log file, useful mostly for debugging
Tune-92544-get.log 4187 Log file, useful mostly for debugging
These files should be available for 24 hours.