Features:
High quality (IMO) pre-amp board with I2C control of inputs and VCA based volume control.
5 line inputs, one may be fitted with an internal RIAA-preamp (phono, for moving magnet cartridges). 2 line outputs with old-style tape copy function and post listening possible.
Power amplifier on/off switching via inbuilt relay river.
KeyStone DAB/FM-module may be fitted.
Custom Raspberry PI power switch with PC-style startup/shutdown, may be controlled over I2C or from a front panel button. Has "breakout" socket for internal USB HDD.
IR Remote Control - RC5 protocol: for input selection, volume control and UI controller navigation.
Main controller built around a Texas Instruments Tiva C MPU, custom UI library with support for KeyStone radio-module.
Raspberry PI for media playback (via Kodi), in my configuration audio is fed via HDMI to a TV and then to a DAC mounted inside the pre-amp cabinet.