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My receive and transmitted audio did not have much highs or lows in it. The filter was only about 1700 Hz wide. I changed the 5 capacitors from the crystals that are used for the filter from 100 pf to 82 pf ( think that is the standard value) and it widened out the audio range . Probably should parallel some 5 or 6 pf capacitors across them to get about 85 to 88 pf as I did not have anything between a low 80 and the 100 pf.
That effects both the transmit and receive response, so you may want to make sure the transmit audio sounds about the same.
On Thu, Jun 14, 2018 at 1:18 PM, Mike <rezycle.bin@...> wrote: