1. Product Overview
The Behringer TD-3-MO-AM is an analog bass line synthesizer designed to produce classic electronic music sounds. It features an all-analog signal path, a 16-step sequencer, transistor wave-shaping circuitry, a built-in arpeggiator, and a 4-pole resonant lowpass filter. This instrument is a modern interpretation of an iconic predecessor, enhanced with modifications to expand its sonic capabilities.
Key Features:
- All-analog Bass Synthesizer with 16-step Sequencer
- Poly Chain Capability
- 4-pole Resonant VCF
- Arpeggiator
- Overdrive
Front Panel Layout
Below is an image illustrating the front panel controls and connections of the TD-3-MO-AM synthesizer. Familiarize yourself with these components before operation.

Figure 1: Front panel of the Behringer TD-3-MO-AM Analog Bass Line Synthesizer. This image displays all knobs, buttons, and input/output jacks, including controls for Tune, Cutoff, Resonance, Envelope, Decay, Accent, Tempo, Wave, Track/Pattern Group, Mode, Gate, Slide Time, Sweep Speed, Filter FM, Volume, and various input/output ports.
2. Setup and Connections
2.1 Unpacking and Inspection
Carefully remove the synthesizer from its packaging. Inspect the unit for any signs of damage during transit. Retain the original packaging for future transport or storage.
2.2 Power Connection
Connect the provided power adapter to the DC IN port on the rear panel of the TD-3-MO-AM. Plug the adapter into a suitable power outlet. Ensure the power switch is in the OFF position before connecting power.
2.3 Audio Output
Connect the AUDIO OUT jack (typically a 1/4" TS or TRS jack, though not explicitly listed in specs, common for synths) on the rear panel to your mixer, audio interface, or amplifier using a standard audio cable. For headphone monitoring, use the PHONES output.
2.4 MIDI and USB Connections
The TD-3-MO-AM supports MIDI and USB connectivity for integration with other musical equipment or a computer.
- MIDI IN/OUT: Use standard 5-pin DIN MIDI cables to connect to other MIDI devices for sequencing or control.
- USB: Connect the USB-A port (as per specifications) to your computer for MIDI over USB and firmware updates.
2.5 CV/Gate Connections
The synthesizer features various CV (Control Voltage) and Gate inputs/outputs for integration with modular synthesizers and other analog gear.
- ACCENT IN, SLIDE IN, GATE IN, CV IN: These inputs allow external control over corresponding parameters.
- SYNC IN, ACCENT OUT, GATE OUT, CV OUT, FILTER OUT: These outputs provide control signals to other devices.
3. Basic Operation
3.1 Powering On/Off
To power on, ensure all connections are secure, then flip the power switch to the ON position. To power off, flip the switch to the OFF position and disconnect the power adapter.
3.2 Sound Generation Basics
The TD-3-MO-AM generates sound using an analog oscillator. Adjust the TUNE, CUTOFF, RESONANCE, ENVELOPE, DECAY, and ACCENT knobs to shape the sound. The WAVE switch selects between sawtooth and square waveforms.
3.3 Sequencer Operation
The built-in 16-step sequencer allows for programming bass lines. Use the MODE switch to select between WRITE and PLAY modes. In WRITE mode, you can input notes and parameters for each step. In PLAY mode, the sequencer will playback the programmed pattern.
- WRITE: For creating and editing patterns.
- PLAY: For playing back patterns.
- TRK/PATT: Selects between Track and Pattern modes for sequencing.
Adjust the TEMPO knob to control the playback speed of the sequencer.
3.4 Arpeggiator
The arpeggiator can generate rhythmic patterns from held notes. Refer to the detailed manual for specific arpeggiator modes and controls.
3.5 Filter and Overdrive
The 4-pole resonant lowpass filter is a key component of the TD-3-MO-AM's sound. Use the CUTOFF and RESONANCE knobs to sculpt the tone. The OVERDRIVE control adds distortion and grit to the sound.
4. Maintenance
4.1 Cleaning
To clean the unit, use a soft, dry cloth. Do not use abrasive cleaners, waxes, or solvents. Avoid spraying liquids directly onto the unit.
4.2 Storage
When not in use for extended periods, store the synthesizer in a cool, dry place, away from direct sunlight and extreme temperatures. It is recommended to use the original packaging for storage.
4.3 Firmware Updates
Periodically check the Behringer website for firmware updates. Updates can provide new features, bug fixes, and performance improvements. Follow the instructions provided with the firmware update package carefully.
7. Warranty and Support
7.1 Product Warranty
Behringer products typically come with a limited warranty covering manufacturing defects. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Behringer website. Keep your proof of purchase for warranty claims.
7.2 Customer Support
For technical assistance, troubleshooting beyond this manual, or service inquiries, please contact Behringer customer support. You can find contact information and additional resources on the official Behringer website: www.behringer.com.
For protection plans, refer to the options available at the point of purchase, such as those offered by Amazon:
- 3-Year Protection Plan
- 4-Year Protection Plan
- Complete Protect (monthly plan)