Behringer CM1A MIDI to CV Converter Module for Eurorack

The Behringer CM1A is a MIDI to CV converter module designed to bridge modern MIDI instruments with analog modular synthesizer systems. It allows MIDI keyboards, sequencers, and digital audio workstations to control Eurorack modules by converting MIDI data into precise control voltages and trigger signals.

At the core of the CM1A is a high-resolution 16-bit Texas Instruments DAC that provides accurate pitch tracking and stable control voltage generation. This enables reliable note conversion from MIDI to CV for modular oscillators while maintaining precise tuning across the keyboard range.

The module features two trigger outputs that can drive envelope generators and other gate-based modules. Flexible trigger modes allow selection between V-Trig, S-Trig, or both simultaneously. With MIDI DIN connectivity and USB support, the CM1A integrates easily with both traditional MIDI hardware and modern computer-based production environments.

Key Features

• MIDI to CV Conversion: Converts MIDI data into analog control voltages for Eurorack synthesizers
• High-Resolution DAC: 16-bit Texas Instruments converter provides precise pitch accuracy
• MIDI Instrument Control: Allows modular systems to be played from MIDI keyboards, sequencers, or DAWs
• Dual Trigger Outputs: Drives envelope generators and other trigger-based modules
• Flexible Trigger Modes: Supports V-Trigger, S-Trigger, or both simultaneously
• MIDI DIN Connectivity: Includes MIDI In and MIDI Thru ports
• USB Integration: USB Type-B port supports computer connectivity and configuration
• Eurorack Compatible: Designed for installation in standard Eurorack modular systems

Technical Specifications

Outputs
CV
Type: 2 x 3.5 mm TS jack, DC coupled
Impedance: 100 Ω
Max output level: -6.3 V to +10 V
CV range, System 100, 2500 series mode: -1 V to +9 V, 1 V/octave
CV range, System 15, 35, 55 mode: -5.3 V to +4.7 V, 1 V/octave
CV modes: Monophonic, duophonic

Trig
Type: 2 x 3.5 mm TS jack, DC coupled
Impedance: 25 Ω
Max output level: +5 V when in V-Trig mode, S-Trig – pull down to 0 V
Trig modes: V-Trig, S-Trig, both; upper = S-Trig, lower = V-Trig

MIDI
Type: 2 x 5-pin DIN
Functions: MIDI In and MIDI Thru
MIDI channel: 1 to 16 set via SynthTribe tool

USB
Type: USB 2.0, Type B

Mode Select (rear panel)
Mode 1, underside LEDs = red/red: System 15, 35, 55 CV range, monophonic
Mode 2, underside LEDs = green/red: System 100, 2500 series CV range, monophonic
Mode 3, underside LEDs = red/green: System 15, 35, 55 CV range, duophonic
Mode 4, underside LEDs = green/green: System 100, 2500 series CV range, duophonic

Power
Power supply: Eurorack
Current draw: 0 mA (+12 V), 10 mA (-12 V)

Physical
Dimensions: 30 x 129 x 520 mm (1.18 x 5.08 x 20.47")
Rack units: 6 HP
Weight: 0.09 kg (0.19 lbs)