pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-54336-mst.ps) >>/Users/jc/w/tmp/Tune-54336-get.log 2>&1" returned status 256
http://bcscontra.org/examples/mst.in

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-54336-get.log 5052 Log file, useful mostly for debugging
Tune-54336-mst.abc 1266 ABC music file with the extracted tune(s)
Tune-54336-mst.ps 42937 PostScript
Tune-54336-mst.txt 1266 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.