Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1818/CTftF.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1871-CTftF.ps) >>/Users/jc/w/tmp/Tune-1871-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1818/CTftF.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-1871-CTftF.abc 142 ABC music file with the extracted tune(s)
Tune-1871-CTftF.ps 6 PostScript
Tune-1871-CTftF.txt 142 Plain-text file with the extracted tune(s)
Tune-1871-get.log 3959 Log file, useful mostly for debugging
Tune-18711-get.log 7752 Log file, useful mostly for debugging
Tune-18714-Gow-CSR-abc2.abc 149 ABC music file with the extracted tune(s)
Tune-18714-Gow-CSR-abc2.ps 6 PostScript
Tune-18714-Gow-CSR-abc2.txt 149 Plain-text file with the extracted tune(s)
Tune-18714-get.log 4035 Log file, useful mostly for debugging
Tune-18716-get.log 4793 Log file, useful mostly for debugging
Tune-18716-newpage.abc 144 ABC music file with the extracted tune(s)
Tune-18716-newpage.pdf 2217 Portable Data Format
Tune-18716-newpage.ps 6 PostScript
Tune-18716-newpage.txt 144 Plain-text file with the extracted tune(s)
Tune-18719-get.log 3272 Log file, useful mostly for debugging
These files should be available for 24 hours.