Hi,
just an idea that the optical encoder is causing the noise, and most probably needs attention, check that all its connections are firm on the sub board and then to the main board . I am not sure that optical encoders when at min mute the signal, that’s why your problem is solved when mute is on. Do you have too much gain?
just an idea that the optical encoder is causing the noise, and most probably needs attention, check that all its connections are firm on the sub board and then to the main board . I am not sure that optical encoders when at min mute the signal, that’s why your problem is solved when mute is on. Do you have too much gain?