pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4401-w.ps) >>/Users/jc/w/tmp/Tune-4401-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/w.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
Coll_44012.log 281709 Log file, useful mostly for debugging
Coll_44017.log 144622 Log file, useful mostly for debugging
Find_44010.log 1456 Log file, useful mostly for debugging
Form_44011.log 1464 Log file, useful mostly for debugging
Tune-4401-get.log 0 Log file, useful mostly for debugging
Tune-4401-w.abc 0 ABC music file with the extracted tune(s)
Tune-4401-w.ps 0 PostScript
Tune-44018-get.log 7911 Log file, useful mostly for debugging
These files should be available for 24 hours.