Michael wrote:

Hiya...

I attempted the sync mod myself but I wound up breaking a pin off of the
stock Motorola chip that is part of the R-75's sync circuit. So, I sent it
to Kiwa. Since I had to send them the radio, I asked them to do the audio
upgrade for me also. Remarkably, they had the radio back to me in a week.

It's good to know there's a plan B.

--
M2