Introduction
The Behringer TD-3-MO-AM is a "Modded Out" Analog Bass Line Synthesizer designed to deliver classic bass sounds with enhanced features. It incorporates a Voltage Controlled Oscillator (VCO), MIDI-Controllable Voltage Controlled Filter (VCF), and a Sub-Harmonics Oscillator, providing a versatile platform for electronic music production. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your TD-3-MO-AM synthesizer.
Product Overview
The TD-3-MO-AM features a pure analog signal path, a 16-step sequencer, and a range of controls for sound shaping. Its compact design and robust construction make it suitable for both studio and live performance environments.

Figure 1: Front view of the Behringer TD-3-MO-AM Analog Bass Line Synthesizer, showcasing its controls and distinctive yellow finish.
Key Features:
- "Modded Out" design with legendary modifications for enhanced sound capabilities.
- Pure analog signal path based on classic VCO, VCF, and VCA designs.
- Sawtooth and square waveform VCO with transistor wave-shaping circuitry.
- Powerful 4-pole low-pass resonant filter with dedicated controls for cut-off, resonance, envelope, decay, and accent.
- Easy-to-use 16-step sequencer with 7 tracks, each supporting up to 250 user patterns.
- Integrated distortion circuit for adding grit and character to your bass lines.
Setup
Before operating your TD-3-MO-AM, ensure it is properly set up according to these instructions.
Unpacking and Inspection:
- Carefully remove the synthesizer from its packaging.
- Inspect the unit for any signs of damage that may have occurred during shipping. If damage is found, contact your dealer immediately.
- Retain the original packaging materials for future transport or storage.
Power Connection:
Connect the provided power adapter to the POWER DC INPUT 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 or disconnecting power.

Figure 2: Rear view of the TD-3-MO-AM, showing the power input, MIDI ports, USB port, and audio output.
Audio Connections:
- Connect the OUTPUT jack (1/4" TS) to your mixer, audio interface, or amplifier using a standard instrument cable.
- For private monitoring, connect headphones to the PHONES jack (1/4" TRS).
MIDI and USB Connections:
- For MIDI control, connect a MIDI cable from your MIDI controller or interface to the MIDI IN port.
- To daisy-chain MIDI devices, use the MIDI OUT/THRU port.
- Connect the USB port to your computer for MIDI over USB functionality and firmware updates.
CV/Gate Connections:
The TD-3-MO-AM offers extensive connectivity for integration with modular synthesizers and other CV/Gate compatible equipment:
- FILTER IN: External audio input for processing through the internal filter.
- SYNC IN: Input for external clock synchronization.
- CV OUT: Outputs control voltage for pitch.
- GATE OUT: Outputs gate signals for note triggers.
Operating Instructions
This section details the primary functions and controls of your TD-3-MO-AM synthesizer.

Figure 3: Angled view highlighting the various knobs and buttons for sound manipulation and sequencing.
- TUNE: Adjusts the overall pitch of the oscillator.
- CUTOFF: Controls the cutoff frequency of the low-pass filter.
- RESONANCE: Adjusts the resonance of the filter, creating a more pronounced or "squelchy" sound.
- ENVELOPE: Controls the amount of envelope modulation applied to the filter cutoff.
- DECAY: Sets the decay time of the envelope.
- ACCENT: Adjusts the intensity of accented notes in the sequence.
- TEMPO: Controls the playback speed of the sequencer.
- WAVEFORM: Selects between sawtooth and square waveforms for the VCO.
- DISTORTION: Engages and controls the built-in distortion effect.
- VOLUME: Adjusts the overall output level.
- SEQUENCER CONTROLS: Buttons for pattern selection, step input, accent, slide, and various time modes.
Sequencing Basics:
The TD-3-MO-AM features a powerful 16-step sequencer. To create a pattern:
- Select a TRACK and PATTERN GROUP using the rotary switches.
- Enter WRITE mode.
- Input notes using the pitch mode buttons (C, C#, D, etc.) and apply ACCENT or SLIDE as desired.
- Press START/STOP to play your sequence.
Refer to the detailed operational guide available on the Behringer support website for advanced sequencing techniques and MIDI implementation.
Maintenance
Proper care and maintenance will ensure the longevity and optimal performance of your TD-3-MO-AM synthesizer.
Cleaning:
- Always disconnect power before cleaning.
- Use a soft, dry cloth to wipe down the exterior of the unit.
- For stubborn dirt, a slightly damp cloth with mild soap can be used, followed by a dry cloth.
- Avoid abrasive cleaners, solvents, or waxes, as these can damage the finish and internal components.
Storage:
- Store the synthesizer in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, it is recommended to use the original packaging or a protective case to prevent dust accumulation and physical damage.
Firmware Updates:
Periodically check the Behringer website for firmware updates. Updates can provide new features, performance improvements, and bug fixes. Follow the instructions provided with the firmware update carefully.
Troubleshooting
This section addresses common issues you might encounter with your TD-3-MO-AM. If you experience problems not covered here, please contact Behringer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output. |
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| MIDI not responding. |
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| Sequencer not playing. |
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Specifications
Detailed technical specifications for the Behringer TD-3-MO-AM Analog Bass Line Synthesizer.
| Feature | Detail |
|---|---|
| Model Name | TD-3-MO-AM |
| Item Model Number | 000-EYG02-00010 |
| Synthesizer Type | Analog Bass Line Synthesizer |
| Oscillator | VCO with Sawtooth and Square Waveforms, Sub-Harmonics Oscillator |
| Filter | 4-pole Low-Pass Resonant Filter (MIDI-Controllable VCF) |
| Sequencer | 16-step, 7 tracks, 250 user patterns per track |
| Connectivity | MIDI In/Out/Thru, USB, Audio Output (1/4" TS), Phones (1/4" TRS), CV/Gate (Filter In, Sync In, CV Out, Gate Out) |
| Dimensions (L x W x H) | 6.5 x 12.01 x 2.2 inches (16.51 x 30.51 x 5.59 cm) |
| Weight | 1.76 pounds (800 grams) |
| Body Material | Bass Wood |
| Color | Amber |
| Manufacturer | Music Tribe US |
Warranty and Support
Behringer products are designed for reliability and performance. For detailed warranty information and technical support, please visit the official Behringer website or contact your local distributor.
- Online Support: Access FAQs, download manuals, and find firmware updates on the Behringer support page.
- Product Registration: Register your product online to receive important updates and activate your warranty.
- Service Centers: Locate authorized service centers for repairs and maintenance.
For the most current information, please visit: www.behringer.com/support





