# V2 Firmware MIDI to CV Utility (2 x channels) with MetaAIO Expander

**URL:** <https://forum.4ms.info/t/v2-firmware-midi-to-cv-utility-2-x-channels-with-metaaio-expander/1488>\
**Category:** Patch Gallery\
**Created:** [May 5, 2025, 3:18pm UTC](https://forum.4ms.info/t/v2-firmware-midi-to-cv-utility-2-x-channels-with-metaaio-expander/1488 "2025-05-05T15:18:45Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![phommed](https://forum.4ms.info/letter_avatar_proxy/v4/letter/p/ce73a5/32.png) [@phommed](https://forum.4ms.info/u/phommed)\
**Post date:** [May 5, 2025, 3:18pm UTC](https://forum.4ms.info/t/v2-firmware-midi-to-cv-utility-2-x-channels-with-metaaio-expander/1488/1 "2025-05-05T15:18:45Z")

</div>

This is a utility patch exploiting the new multi-MIDI channel input capability of the v2 MM firmware to turn the MM+MetaAIO into a 14-out MIDI to CV monster.

- MIDI Channel 2 to V/O+Gate outputs, and 8 MIDI CC outs (ccs 1-8)
- MIDI Channel 3 to V/O+Gate outputs and 4 MIDI CC outs (ccs 1-4)
- Each CC is routed through an attenuverter, which is mapped to a knobset control.

**Internal CV Path:**

- MIDI Channel 2 MIDI CCs 1-8 are mapped to 8 Venom KNOB controls, then to Befaco Atte modules then to MM+MetaAIO output sockets (MM3-8, MetaAIO 9-10)
- MIDI Channel 3 MIDI CCs 1-4 are mapped to 4 Venom KNOB controls, then to Befaco Atte modules then to MM+MetaAIO output sockets (MetaAIO 13-16)
- RackCore MIDI To CV (MIDI Channel 2) V/O+Gate mapped to MM output sockets 1-2
- RackCore MIDI To CV (MIDI Channel 3) V/O+Gate mapped to MetaAIO output sockets 11-12.

**Metamodule knob mappings:**

Page “Channel 2 (1x8)”:  
u - MIDI Channel 2 CC 1 attenuverter  
v - MIDI Channel 2 CC 2 attenuverter  
w - MIDI Channel 2 CC 3 attenuverter  
A- MIDI Channel 2 CC 4 attenuverter  
x - MIDI Channel 2 CC 5 attenuverter  
y - MIDI Channel 2 CC 6 attenuverter  
z - MIDI Channel 2 CC 7 attenuverter  
F- MIDI Channel 2 CC 8 attenuverter

Page “Channel 3 (1x4)”:  
B - MIDI Channel 3 CC 1 attenuverter  
C - MIDI Channel 3 CC 2 attenuverter  
D - MIDI Channel 3 CC 3 attenuverter  
E - MIDI Channel 3 CC 4 attenuverter

**Plugins Needed:**

Needs Venom, RackCore and Befaco plugins to be installed. Uses 36% CPU at 48kHz/256.

 ![image](https://forum.4ms.info/uploads/default/original/2X/c/c1c027b73c749f0fb5183a18f2cd295602e6f31f.jpeg)

The patch was first built in VCVRack for the knobsets, but then had to be manually completed on the MM itself to add MIDI channel - specific CC knob mapping and V/o+gates using 2x  
the MM - only RackCore plugin. Hopefully this will be improved in the future to enable a patch with multi MIDI channels to be built in VCVRack and transferred to MM.

I built this to control two Eurorack voices using MIDI generated from a customised version of Tim Exile’s [Scapeshift generative Reaktor ensemble](https://www.timexile.com/scapeshift) (which is why I used MIDI channels 2 & 3 from Scapeshift’s Bass and Lead engines).

[1x81x4V2 MIDI CC.yml](https://forum.4ms.info/uploads/short-url/feMNt3pELkSQZtMVxDcUXfb1C3.yml) (12.1 KB)  
[1x81x4V2 MIDI CC.vcv](https://forum.4ms.info/uploads/short-url/2izhIx9lcgDRuKdYaRanMKlqCX8.vcv) (2.8 KB)

---

<div class="post-metadata">

**Author:** ![degarr](https://forum.4ms.info/letter_avatar_proxy/v4/letter/d/54ee81/32.png) [@degarr](https://forum.4ms.info/u/degarr)\
**Post date:** [May 15, 2026, 10:41am UTC](https://forum.4ms.info/t/v2-firmware-midi-to-cv-utility-2-x-channels-with-metaaio-expander/1488/2 "2026-05-15T10:41:42Z")

</div>

This is proving the value of this forum. To search and find a year old post that solves a problem I was exploring and receive bonus dialogue on Scapeshift which I purchased from Tim. I lost interest when I could not tweak the midi out in his Reaktor code to externalise his instrument. Is this what was customised? I would imagine Scapeshift into your rack would be wonderful.