Hi Gang I don't know if my NB is working like it should. Both NB1 and 2 work exactly the same when the bedroom light dimmers are on, cuts the noise from s9 down to s3 and I can copy the signal. BUT, when either is on, the NB level or width (nb2) do absolutely nothing. It's like NB 1 and 2 are either on or off with no parameter control and the both react exactly the same?? thx bob