Aviom A320 Personal Mixer Modes
The A320 Personal Mixer can operate in 16-Channel or 32-Channel modes. It's easy to switch between the two. The A320's mode is changed with a button combination applied during power-up. Hold the Mute button plus the Channel 2 button while powering up the unit to set it to the 32-channel mode. Hold Mute plus the Channel 1 button while powering up the unit to go back to the 16-channel mode. http://www.aviom.com/AviomProducts/A320-Personal-Mixer.php