Here is my Buffalo24 with IVY and MUX and defeatable Metronome. The 20x4 lcd, the OTTO and the I2C bus is driven by a SEEEDUINO Mega Arduino compatible MCU.
The I2C 3.3v conversion is performed by Analog Devices iCoupler Isolator ADUM1250 and the 3.3v control lines selection by Analog Devices ADG3304.
A rotary encoder is used for volume selection. Sony remote Control and the rotary encoder is implemented ala HIFIDUINO style
