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Just an update, I tried to use the line out from the Andrea USB sound card to the line-in of my in onboard soundcard. As soon as I did that, I noticed a lot of engine noise because its right under the center console close to the engine. I already have a ground loop isolator for my other sound card, dont want to invest in another one just for this. I will try to move the card to the trunk and try testing it again.
I did test the echo cancellation with the onboard audio out and just the mic and it does seem to do a good job when you have the directional beam option setup. But with the "speaker phone" option the other party could still hear echo of their own voice. I had to to turn down the speakers to stop the echo.
I will test it again after moving the sound card to the back. Let me know if you have any questions.
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