Set metadata for blank() source

[hayden-t]

You can use the map_metadata function to set metadata tags for a silence generated be blank()

# This creates a 1 second silence period generated programmatically (no disk reads)
silence = blank(duration=1.)

def append_title(meta) =
  [("title","Scanning...")]# Silence metadata
end

silence = map_metadata(append_title, silence)
# This creates a 1 second silence period generated programmatically (no disk reads)

[toots]

Thanks, good trick!