I sure wish you had a before and after .wav of this. Sometimes QSK is tough because the "between" is hard on the sidetone. I wonder if I did the same thing! It's just as nasty as on my previous radio (early '80's Swan) so I figured it was just part of QSK. Now, you have me wondering. Dan / WG4S / K2 #2456 <snip>...switched C1 and C33, (2,2 and 22 uF ).</snip>