pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-12643-1799_Preston.ps) >>/Users/jc/w/tmp/Tune-12643-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/1799_Preston.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-12643-1799_Preston.abc 20772 ABC music file with the extracted tune(s)
Tune-12643-1799_Preston.ps 124087 PostScript
Tune-12643-1799_Preston.txt 20772 Plain-text file with the extracted tune(s)
Tune-12643-get.log 17354 Log file, useful mostly for debugging
These files should be available for 24 hours.