On Tue, 22 Nov 2005 10:16:15 -0700, Newps wrote
in ::

The Garmin audio panel allows
the two pilots to each talk on a separate radio, on different freq's, at
the same time.

That's not what it says he
http://www.garmin.com/products/gma347/

The GMA 347 audio panel builds upon the successful attributes of
the GMA 340 while adding benefits such as automatic squelch,
digital clearance recorder, and a full-duplex telephone interface.

The GMA 347's automatic squelch option makes the entire audio
experience quieter and clearer. Since there are some occasions
when pilots wouldn’t want an automatic squelch—such as high-noise
environments—the GMA 347 also retains the manual squelch
adjustment feature. Garmin has also added three more unmuted,
unswitched inputs with individual volume control.

The GMA 347’s automatic digital clearance recorder helps pilots
manage the demands of a busy cockpit. The unit continuously
captures the last two and one half minutes of audio switched
through the panel. If a pilot misses a frequency change or
clearance, he or she can replay the necessary information by
simply pressing the “play” button.

In addition, the GMA 347 has a full-duplex telephone interface
with intercom isolation and disable capability. This feature
allows private telephone calls by the pilot or copilot, or
multi-party calls with crew and/or passengers.

Pilots will also appreciate the integration of the G1000’s
“configuration module” into the GMA 347. If the audio panel is
ever removed, all of the pilot’s preferred settings are
automatically loaded into the unit.

Garmin part number: 010-00275-01