Ivan Salazar of the Audio Amplifiers Forum said I should ask here. I am looking for a replacement/equivalent for STMicro TDA7309D, Digital Controlled Stereo Audio Processor with Loudness. It is an I2C controlled DP4T switch on the input with volume control and mute for stereo audio. Perhaps there is a suggestion of a two IC solution, a MOSFET switch followed by a stereo amplifier.