Something I didn't know about my new (to me) SL-30 is that it has a built-in voice activated intercom. Are you SL-30 owners using this feature, or a stand alone box? I'm looking at interfacing the SL-30 with a Skyview system, and it would be nice not to have to buy another box for this function. Any disadvantages to the SL-30's built-in vs Dynon's box?