Sounds like what's in the back is actually a discriminator tap not an external speaker output. It's unaffected by squelch and volume controls, just pure audio data that hits the radio after it gets discriminated by frequency. How about this, run a head phone splitter into the head phone jack, then connect one side to some external speakers and hook your audio patch cable to the computer in the other.
KF5QGF
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Craig N.
KF5QGF
Alinco DX70, Alinco 570, Baofeng UV-5R, RS Pro-404, RS Pro-163, Yaesu 2500,
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