happy-nerding-3xmia

Happy Nerding 3xMIA

Six-channel attenuverting mixer with flexible routing

6 HP Eurorack module

3xMIA is a versatile 6-channel attenuverting mixer from Happy Nerding. It provides three independent attenuverter channels, each with two inputs (A and B) that are summed at the output. The A inputs pass through the attenuverter knob which can boost, attenuate, or invert the signal. With nothing patched, each channel's knob generates a DC offset voltage (approx ±8V), making 3xMIA equally useful as a precision voltage source. Two cascade switches allow channels to be linked into a 4- or 6-input summing mixer. The module handles both audio and CV with equal precision, and bi-color polarity LEDs provide instant visual feedback of output state. At just 6HP, it is one of the most space-efficient utility modules available.

Features

  • DC coupled for audio and CV
  • Built-in offset generation
  • Dual concentric potentiometers
  • Flexible mix routing
  • Reverse power protection
  • Attenuverting capability

Controls & Jacks (20)

  • Level 1— {"tips": ["With nothing patched to A 1 In, this knob generates a variable DC offset from about -8V to +8V — perfect for biasing other module
  • Level 2— {"tips": ["With nothing patched to A 2 In, generates a variable DC offset — great for manual voltage source", "Cascading: when Channel 1 out
  • Level 3— {"tips": ["With nothing patched to A 3 In, generates a variable DC offset", "Channel 3 is the final stage — if channels 1 and 2 cascade down
  • Attenuverter 1— {"tips": ["Use cascade mode to build a 4-input mixer: patch 2 signals to Ch1 A/B and 2 to Ch2 A/B, take output from Ch2", "Independent mode
  • Attenuverter 2— {"tips": ["With both toggles set to cascade, channel 3 output becomes a 6-input summing mixer of all channels", "Middle position on some uni
  • Signal LED 1— {"basic_tip": "Glows when signal is present — brighter means higher level.", "description": "LED showing signal presence and level at channe
  • Signal LED 2— {"basic_tip": "Glows when signal is present.", "description": "LED showing signal presence and level at channel 2."}
  • Signal LED 3— {"basic_tip": "Glows when signal is present.", "description": "LED showing signal presence and level at channel 3."}
  • Polarity LED 1— {"basic_tip": "Watch this to monitor signal polarity — green means positive, red means negative/inverted.", "description": "Bi-color LED ind
  • Polarity LED 2— {"basic_tip": "Green = positive output, red = negative/inverted.", "description": "Bi-color LED indicating signal polarity and level at chan
  • Polarity LED 3— {"basic_tip": "Green = positive output, red = negative/inverted.", "description": "Bi-color LED indicating signal polarity and level at chan
  • A 1 In— {"tips": ["Normalled to an internal reference so unplugging creates a manual offset generator"], "basic_tip": "Patch a signal here to attenu
  • B 1 In— {"tips": ["Useful for adding a fixed offset or mixing two CV/audio sources through one channel"], "basic_tip": "Patch a second signal here t
  • ±A±B 1 Out— {"tips": ["In cascade mode, patching a cable here breaks the normalization — channel 2 no longer receives channel 1's output"], "basic_tip":
  • A 2 In— {"basic_tip": "Patch a signal here to attenuvert it with the Level 2 knob.", "description": "Input A for channel 2. Accepts audio or CV sign
  • B 2 In— {"basic_tip": "Patch a second signal here to mix it with the processed A 2 input.", "description": "Input B for channel 2. This signal is su
  • ±A±B 2 Out— {"basic_tip": "Take your processed signal here.", "description": "Output for channel 2. Outputs the sum of the attenuated/inverted A input a
  • A 3 In— {"basic_tip": "Patch a signal here to attenuvert it with the Level 3 knob.", "description": "Input A for channel 3. Accepts audio or CV sign
  • B 3 In— {"basic_tip": "Patch a second signal here to mix it with the processed A 3 input.", "description": "Input B for channel 3. This signal is su
  • ±A±B 3 Out— {"basic_tip": "Take your processed signal here. In full cascade mode this is the master mix output.", "description": "Output for channel 3.

How-To Guides

  • CV Mixing Setup
  • Audio Crossfading
  • CV Offset Generation
  • Master Audio Mixer
  • Dual CV Processor
  • Signal Inverter

Explore the interactive 3xMIA panel on BleepDex — tap any control to learn what it does.

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