MRF90 - Controller BOSS - Free user manual and instructions
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| Type | Controller |
| Brand | Boss |
| Model | MRF90 |
| Category | Foot controller for effects processors |
| Dimensions | Approx. 250 × 130 × 60 mm |
| Weight | Approx. 1.2 kg |
| Power Supply | 9V DC adaptor (centre negative) or 6 × AA batteries |
| Current Draw | 90 mA |
| Connectivity | MIDI In/Out, USB, 1/4" input |
| Controls | 3 footswitches, 4 rotary knobs, 1 expression pedal |
| Display | 7-segment LED |
| Memory | 99 presets |
| Compatibility | Works with BOSS multi-effects and amps |
| Construction | Heavy-duty metal chassis |
| Maintenance | Wipe with a soft dry cloth |
| Safety | Do not expose to moisture or direct sunlight |
| Repairability | Component-level service by qualified technician |
| Included Accessories | Owner's manual, adhesive rubber feet |
| General Information | Designed for stage and studio use |
Frequently Asked Questions - MRF90 BOSS
What is the BOSS MRF90 used for?
The BOSS MRF90 is a foot controller designed to manage the functions of BOSS multi-effects units and amplifiers. It allows you to switch presets, control parameters in real time, and use an expression pedal for volume or modulation effects.
How do I power the MRF90?
You can power the MRF90 using a 9V DC adaptor (centre-negative) or six AA batteries. When using batteries, note that the typical battery life is about 10 hours. It is recommended to use an adaptor for extended sessions.
Can I connect the MRF90 to a computer?
Yes, the MRF90 has a USB port for connecting to a computer. This allows you to update firmware, backup presets, and control DAW or MIDI software. Ensure you install the appropriate BOSS USB driver from the official website.
How do I reset the MRF90 to factory settings?
Press and hold the Preset and Exit switches while turning on the device. Keep holding until the display flashes 'rS'. Then press Write to confirm. The device will restore all factory presets and settings.
Does the MRF90 support MIDI?
Absolutely. The MRF90 features 3-pin MIDI In / Out jacks and a USB MIDI interface. It can send and receive program changes, control changes, and real-time messages to control external MIDI devices.
How do I clean and maintain the MRF90?
Use a soft dry cloth to wipe the surface and connectors. Avoid using solvents or abrasive cleaners. Keep the device away from dust, moisture, and extreme temperatures. Periodically check the cable connections for oxidation.
What is the current draw of the MRF90?
The current draw is approximately 90 mA. This is important when choosing a power supply. If you use an adaptor, ensure it can supply at least 200 mA for best performance.
Can I use the MRF90 with third-party devices?
Yes, the MRF90 uses standard MIDI and analog control signals, making it compatible with most guitar processors, synthesizers, and audio interfaces. However, certain advanced features may only work with BOSS products.
How do I attach the expression pedal?
The expression pedal comes pre-assembled. If you need to adjust the tension, use the adjustment screw on the side. To calibrate the pedal range, hold Calibrate and sweep the pedal from heel to toe for the full range.
What are the main features of the MRF90?
Key features include 99 factory presets, assignable footswitches, an expression pedal, MIDI connectivity, a 7-segment LED display, and a rugged metal chassis. It is designed for both stage performance and studio production.
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USER MANUAL MRF90 BOSS
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Product information
Brand : BOSS
Model : MRF90
Category : Controller