pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18210-walsh.ps) >>/Users/jc/w/tmp/Tune-18210-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/bath.ac.uk/exxhf/music/walsh.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-18210-get.log 14566 Log file, useful mostly for debugging
Tune-18210-walsh.abc 705 ABC music file with the extracted tune(s)
Tune-18210-walsh.ps 38934 PostScript
Tune-18210-walsh.txt 705 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.