pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3618-m.ps) >>/Users/jc/w/tmp/Tune-3618-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/m.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_3618.log 139782 Log file, useful mostly for debugging
Coll_36185.log 327952 Log file, useful mostly for debugging
Form_36188.log 829 Log file, useful mostly for debugging
Tune-3618-get.log 6837 Log file, useful mostly for debugging
Tune-3618-m.abc 342 ABC music file with the extracted tune(s)
Tune-3618-m.ps 35862 PostScript
Tune-3618-m.txt 342 Plain-text file with the extracted tune(s)
Tune-36180-get.log 4083 Log file, useful mostly for debugging
Tune-36184-get.log 3455 Log file, useful mostly for debugging
Tune-36189-get.log 3924 Log file, useful mostly for debugging
These files should be available for 24 hours.