The Xer Dualis from Noise Engineering is a slim and simple 4-channel stereo mixer

Xer Dualis (XD) is ideally suited as a sub-mixer in a large system, or as a stand-alone mix unit in small to-go systems. XD has a right and a left input for audio for each of the four channels. For mono signals, you simply use the left, which is normalized to the right. Each channel has a mute switch and a pot to adjust the levels. Lastly, there is a simple meter LED and a clipping indicator for the stereo output.

Features:

• four stereo channels
• mute switches
• clipping and meter LED