pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-11134-Chestnut.ps) >>/Users/jc/w/tmp/Tune-11134-get.log 2>&1" returned status 256
http://tunearch.org/wiki/Chestnut

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_11134.log 834 Log file, useful mostly for debugging
Tune-11134-Chestnut.abc 177 ABC music file with the extracted tune(s)
Tune-11134-Chestnut.ps 30883 PostScript
Tune-11134-Chestnut.txt 177 Plain-text file with the extracted tune(s)
Tune-11134-get.log 4019 Log file, useful mostly for debugging
These files should be available for 24 hours.