A soft mute circuit includes a programmable amplifier controlled by a register.
Data is stored in the register from an adder that combines the current data in
the register with a second number for increasing or decreasing the gain of the
amplifier. A summation circuit includes a plurality of inputs coupled by gates
to a summation node and the summation node is coupled to an input of the programmable
amplifier. The gates are controlled by suitable logic for selecting input signals
in any combination. A control loop maintains the gain of the amplifier at a predetermined level.