Altera Cyclone II FPGA Starter - Manual (Page 18)

2–4 Altera Corporation
Cyclone II FPGA Starter Development Kit User Guide October 2006
Confirming Board Operation
6. Set the toggle switch SW9 to the UP position and connect the output
of an audio player (for example: MP3, PC, iPod) to the Line In
connector on the development board. Confirm that the headset
produces the expected music or recorded sounds playing on the
audio player.
1
If you also connect a microphone to the Mic In connector, the
development board mixes the voice input with the output from
the audio player.