A basic 8 channel sound card (8kHz 16bit) running on a atmega32u4 controller. A mcp3208 is being used as ADC. The USB device implements a card with two devices each having 4 streams.

32u4		MCP3208
PB0 CS	 	10	
PB1 CLK  	13
PB2	MOSI 	11
PB3 MISO 	12

It is based on the LUFA library To compile you need to download the library and place it in the same root directory. A compiled hex is in the repository.