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.
