Need a simple yet flexible mixer for your Eurorack rig? Get the Doepfer A-138b 4-channel linear mixer. You can use it for audio or control voltage signals, and each input has an attenuator to manage signal levels. It's a great way to mix the audio outputs of your modules on the way to your interface or mixing board, and the logarithmic potentiometers make it especially useful for audio signals. Somewhere along your adventures with Eurorack, you're going to want an effective mixing solution, and Sweetwater recommends the Doepfer A-138b linear mixer module.