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How do I use a microphone with the THAT-2?

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THAT-2 needs a "line level" signal to send audio down the phone line. You'll either have to get a microphone pre-amplifier or mic mixer.

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We're using THAT-2 to get caller audio to broadcast on our call in radio show. It works but we'd like to get better sound quality. What do we do?

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THAT-2 was not really designed to do what you're talking about. As you said, it works but not very well. You should look into getting an Innkeeper digital hybrid. The Innkeeper was designed specifically for this purpose.

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I'm using THAT-2 for interview recording and playback over the telephone. Every time I press in the gray button I get a loud squeal and feedback. How do I fix this?

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Try changing the setting of the ABC handset selector switch. If the handset type is not set correctly you could get the feedback you are describing. Trial and error works best to find the right handset type but this info also may help. Handset Types:

• A=Electret
• B=Dynamic
• C=Carbon

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What is the gray pushbutton on THAT-1 and THAT-2 used for?

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The button is used to select which audio signal will be sent into the telephone.
OUT = talking on the handset,
IN = sending audio through the RCA jack.
Keep in mind that you cannot send audio into the RCA jack and talk on the handset at the same time. However, any audio that is sent into the telephone can be heard on the handset and is available on the RCA output jack at all times.