The unfiltered audio can be found at the top of R228. Some internet sources mention R230, but this is incorrect.
R230 is part of a lowpass filter, which causes fast data signals to be distorted.
A 10 k resistor is connected with the top of R228. A piece of wire is connected to the resistor's other lead.
The other end of the wire is connected to L20, a wire connection containing a ferrite bead. L20 is located between the AGC jumper block and the
AGC cinch connector. The jumper is removed. This way, the (rarely used) AGC output has been converted into a discriminator output..