[Bug 607321] improve GstDTMFSrc

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=607321
  GStreamer | gst-plugins-bad | unspecified

--- Comment #7 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2013-04-21 18:25:32 UTC ---
In music synths, on param is the trigger parameter. You would set e.g. method
and volume and when you write number, it starts a new tone using the volume and
method currently set. In buzztard I would make 'number' write-only to indicate
that this is the trigger param.

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