pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-79091-tune-134-knifes-edge.ps) >>/Users/jc/w/tmp/Tune-79091-get.log 2>&1" returned status 256
http://lesters-tune-a-day.blogspot.co.uk/2013/01/tune-134-knifes-edge.html

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-79091-get.log 25929 Log file, useful mostly for debugging
Tune-79091-tune-134-knifes-edge.abc 218 ABC music file with the extracted tune(s)
Tune-79091-tune-134-knifes-edge.ps 33678 PostScript
Tune-79091-tune-134-knifes-edge.txt 218 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.