When you need to combine mono audio sources, it’s hard to beat the simplicity of the Behringer Micromix MX400, When you really need the convenience of a compact, portable 4-in/1-out mixer. The Micromix MX400 gives you control over the input level of each channel, and Behringer promises low-noise operation from 4580 op amps. Whether you’re combining keyboard signals, sending multiple signals to a single speaker, or any other small-scale mixing task, you’ll be glad you have the Behringer Micromix MX400