set up

REACTA is shipped with basic settings,

The design is based on the assumption that it will be readjusted to suit the usage environment and playing style.

  • Introduction

  • 1｜Connect to PC

  • 2｜Start connection

  • 3｜Connection confirmation

  • 4｜Calibration

  • 5｜Stick adjustment

  • 6｜Trigger adjustment ①

  • 7｜Trigger adjustment②

  • 8｜Controller Settings

  • 9｜Trigger Configuration

  • 10｜LED settings

  • 11｜Button assignment

  • 12｜Polling Rate

  • 13｜Apply settings

  • 14｜Complete

Introduction

Calibration is a required process when using the tool. If calibration is not performed on a PC, other setting items will not be enabled.

Also,

If you change the PC you are using

If you feel uncomfortable with the settings

After the update

Please perform calibration again.

Calibration Tools

*The dedicated web tool will open in a separate tab.

Once opened, follow the instructions on this page.

*Calibration/updates are for PC (Windows/Mac) only.

1｜ Connect to PC

Connect your PC and controller with a USB cable.
When connecting, hold down the PS button.

When the LED indicator changes, you are in setup mode.


* Whenever possible, connect directly to the USB port of your PC.

2｜Start the connection

Tap [Connect Controller] on the calibration tool. Communication with the controller will begin.

3｜Check the connection

When the device list is displayed, select the connected controller and connect it. If it is recognized successfully, proceed to the next step.

4｜Calibration

When the setup screen appears, follow the on-screen instructions to begin calibration.

*Do not touch the sticks or triggers until instructed to do so.

4｜Stick adjustment

Follow the on-screen instructions and slowly move the left and right joysticks to their maximum.

By correctly recognizing inputs in each direction, the center position and range of motion of the stick are optimized.

*Do not touch the stick until instructed to do so.

6｜Trigger adjustment ①

Perform initial trigger adjustment by quickly clicking the left trigger (L2) as instructed on the screen.

Trigger


Press firmly and then release naturally. Repeat this action five times.

*If you are using a click trigger, skip to step 【9】 .

7｜Trigger adjustment②

Next comes the precision adjustment of the trigger.
Press it all the way in and then slowly release it. If you've done it correctly, the counter will advance.


Once you've completed the left, do the same with the right trigger (R2).

8｜Controller Settings

Once calibration is complete, you will be taken to the main controller settings screen.

On this screen,

Check the stick position

Deadzone Adjustment

Manual correction of stick center position

Stick Curve Adjustment

You can do things like:

9｜Trigger Configuration

You can adjust the position at which the trigger is determined to be "pressed" while looking at the screen.

Check the input threshold and set it to suit your playing style.

10｜LED settings

Customize the LED display on your controller.

You can change the color and brightness to customize the display to your liking.

11｜Button assignment

Supports remapping of up to 6 rear buttons.

The MERKA.G customization only has two back buttons. Here you can set the assignments for the back buttons.

When you press the button you want to assign, the corresponding item will be highlighted on the screen. Adjust the assignment while checking the display.

12｜Polling Rate

The polling rate can be adjusted from 125Hz to 8000Hz.

If performance is important, we recommend setting it to 8000Hz.

* Depending on your environment (PC performance and connection status), high settings may cause unstable operation.
In that case, adjust it to a stable value.

13｜Apply settings

Once all adjustments are complete, save the current settings.

The settings will be reflected on the controller itself.

14｜Complete

On the next screen, please wait until all checks are completed.

At the bottom of the screen, you will see "Settings complete" (settings have been applied successfully).


If this is displayed, everything is complete.
Please enjoy.

Feature Details Guide

  • Introduction

  • 1｜Stick adjustment

  • 2｜Trigger adjustment

  • 3｜Back button assignment

  • 4｜Polling Rate

  • 5｜LED settings

Feature Details Guide

This guide explains the various adjustment functions that can be performed after calibration is complete.

To optimize the feel of the controls, please make fine adjustments to suit your environment and playing style.

This guide outlines the role and priority of each adjustment item.

We recommend that you start by adjusting the sticks.

Setting Priority

We recommend that you start adjusting the items that directly affect input and operation feel.

Stick adjustment

Trigger Adjustment

Rear button assignment

Polling Rate

LED Settings

Stick adjustment

With REACTA, you can do everything from checking stick operation to making fine numerical adjustments.

The adjustments are divided into the following functions:

  • Select to see details

  • basic

  • Advance

  • Re-Center

  • readjustment

  • curve

  • Dead Zone

⚠ Stick adjustment (important)

Since sticks are subject to individual differences, the numbers may not be the same for the left and right sticks.

*Even after calibration, there may be differences in the center position, how far the maximum input reaches, and how far it returns.
This is by design and is not necessarily a defect.

*It is recommended to adjust the values ​​so that the actual operation feels natural rather than "aligning the left and right".

Introduction

Trigger adjustment allows you to change how the input responds to pressure.

You can adjust the timing of when to start shooting and the position where the maximum input occurs.

  • Select to see details

  • Trigger Mode

  • Static/Maximum Input

  • Hair Trigger Threshold

⚠ If you have implemented a click trigger/click bumper

Since this is a physically digital (ON/OFF) operation, the analog adjustments on this page are not necessary.

*If it is clickable, the input will not change depending on how much you press it.

Rear button assignment

You can assign any button input to the rear buttons.

By placing jumping, crouching, reloading, etc. on the back, you can operate them without taking your thumb off the stick.

■ Allocation method

From "External Input Mapping", select the button number you want to set.

Open the drop-down menu and select the input you want to assign.

If necessary, press the physical button to identify it.

Once the settings are complete, they will be saved.

To remove it, change the assignment back to "None."

⚠ For models without rear buttons

This function cannot be used on models without rear buttons.

Polling Rate

The polling rate indicates how often the controller sends input information to the PC.

The unit is Hz (Hertz).

■ The higher the number,

Less input lag

Smoother input

■ The lower the number, the better.

Light load on the PC

Operation is stable

■ Recommended settings (PC)

1000Hz to 8000Hz

8000Hz is available on high performance PCs.

⚠ Attention

Depending on the CPU performance and USB environment, operation may become unstable when set to a high value.
If operation is unstable, lower the value.

LED Settings

You can change the LED display on the controller.

■ Mode

OFF: Turns off the LED.

STATIC: Always on.

BREATHING: Flashes slowly.

■ Brightness (Intensity)

You can adjust the brightness of the LED.

The higher the value, the brighter it becomes.

■ Color

You can change the color that is displayed.

You can specify a color using the color picker or a color code (e.g., #00FFFF).

About updates

REACTA is scheduled to continue to add new features and improve the game.

Check below for the latest updates and tools.

  • Introduction

  • 1｜Connect to PC

  • 2｜Start connection

  • 3｜Connection confirmation

  • 4｜Select version

  • 5｜Installation

  • 6｜Update completed

Introduction

REACTA ships with stable firmware installed, so no updates are required for normal use.

Follow these instructions to update only if bugs have been fixed or new features have been added.

Update Tool

*The dedicated web tool will open in a separate tab.

Once opened, follow the instructions on this page.

*Calibration/updates are for PC (Windows/Mac) only.

1｜ Connect to PC

Put the controller in an update-enabled state.

Hold down R3 (Right Stick Press).

Press and hold while connecting the USB cable to your PC.

Continue holding it until the LED turns green.

When the LED turns green, it's ready to go.

2｜Start the connection

Click "Connect Device" at the bottom of the screen. Once connected, the update tool will recognize the controller.

3｜Connection confirmation

When the device list is displayed, select the connected controller and connect it. If it is recognized successfully, proceed to the next step.

4｜Select version

Once the connection is complete, a list of firmware versions that can be installed will be displayed.

where:

Upgrade to the latest version

Downgrading to a previous version

Either option is available.

Please follow the instructions for your operating environment and troubleshooting and select the version you wish to install.

4 | Installation

Once you have selected the version, click Install Selected Firmware.

During installation

Do not unplug the USB cable

Do not perform any other operations

Please do.

6｜Update complete

Once the firmware update is complete, the controller will automatically reboot into normal mode.

Be sure to perform calibration after updating.
If you do not do this, stick operations will not be reflected correctly.
Continue to the calibration tool and complete the setup.

Upgrade/Downgrade

Even if you update again

* Calibration is required after updating. If you do not perform it, you will not be able to operate the sticks.

Important Information

The biggest feature of the REACTA board is that it supports a native 8K polling rate , so there is no need to use third-party overclocking software. The JDM-5X can be configured through the setup link provided in the FAQ and supports the following onboard settings:

- Remappable rear buttons

- Inner/outer dead zone adjustment

-Customize stick curve response

This product is a custom board and does not include the following features:

・Console connection function ・Bluetooth connection ・Macro function ・Key assignment function ・Vibration motor ・Touchpad function ・Battery

Do not overclock. REACTA already operates at an optimal 8K polling rate. Attempting to overclock may result in instability or slower response times. For best performance, connect directly to the USB port (USB-C to USB-A) on the back of your PC.

support

Support and Additional Information

For support and the latest information regarding Mr. Marius, please refer to the official platforms below:

 

Website

YouTube

Instagram

X / Twitter

Patreon

Discord

Frequently Asked Questions

 Can I play it right out of the box?

Yes, it can be used immediately after unboxing. Our technicians set it up and calibrated it before shipment.


※The initial settings have been optimized, but you can also customize them to your preferences at https://setup.mariusheier.com.

Connection method and terminal specifications

Since the REACTA board is designed with input accuracy as its top priority, its operation may vary depending on the connection environment.

 

・ Depending on your PC's specifications or gaming environment, USB-C to USB-A may not function correctly.

・ If operation is unstable, please use USB-C to USB-C.

・ Do not use a USB hub or front USB ports; connect directly to the I/O ports on the back of your PC.

*Due to USB control specifications, recognition failures, unstable connections, or reduced polling rates may occur.
*This is not a product defect.

Do I need additional software to use it on a PC?

Not necessary. REACTA (JDM-5X) uses the same form factor as the PS4, but it is not a PS4 compatible board. It is designed exclusively for PC, so you can use it plug-and-play without additional software such as DS4-Windows.

Setup Configuration and Update Links

To set up, readjust, or remap buttons, please access the following link:

 

Setup:
https://setup.mariusheier.com/

 

For the latest firmware and update information, please use Marius's official channels.

 

Firmware update page:
https://update.mariusheier.com/

 

For update announcements, please refer to the official channels operated by Marius.

Please tell me about the initial setup for MERKA.G.

Stick Settings

Inner Dead Zone: 1 - 2%
Outer Dead Zone: 3 - 5%

 

By increasing the outer dead zone, we keep the circularity error rate within a range similar to genuine products, reducing the risk of sluggish diagonal movement.
In detailed mode, fine-tune so that each basic direction (up, down, left, right) easily reaches its maximum value (exact values vary by controller).

 

Trigger Settings

Mode: Analog (For details, please refer to "Which mode should I set the trigger to?")
Rest Position: Individually adjusted for each controller

Press (Maximum Input Position): Individually adjusted for each controller

Hair Trigger Threshold: 100% (This slider does not work as expected, so we set it to 100% to effectively disable it.)

 

LED

Color: #FF5300 (MERKA.G Orange)

 

Back Buttons

Left: X

Right: O

 

Polling Rate

8000Hz

Which mode should I set the trigger to?

For all REACTA (JDM-5X) enabled controllers, set the triggers to Analog. This applies to both stock triggers and click triggers.


Do not select "Skip this step" during initial setup. If you accidentally skip it, you can correct it by re-running the setup. Please verify that it is set to Analog in the [Trigger Configuration] section of the settings menu.
If you select Digital, the controller will be instructed to look for triggers on the Eagle board, and will not function correctly.


*This information is subject to change with future board revisions or software updates. Last updated: March 13, 2026

Even if I change the hair trigger threshold, the response does not change.

With REACTA (JDM-5X), the hair trigger threshold slider does not work as expected.

Therefore, with MERKA.G, we set it to 100% to effectively disable it.

What should I do if the board does not operate at 8KHz?

Please check the following first:

 

Setup settings: Check if the polling rate slider has been reset and resave the calibration.
Cable specifications: USB-A to USB-C, USB 3.0 or higher is recommended.
USB port: Avoid USB hubs and front panels; connect directly to the motherboard.

 

If the above does not resolve the issue, please request support on Marius's Discord server at https://discord.com/invite/QcCkfbkp3S.
*To check the polling rate, please use the DEEPPOLL tool at https://tools.mariusheier.com.

Where can I check the polling rate?

Please use the DEEPPOLL tool at https://tools.mariusheier.com.
*This tool is for measuring polling rate only. It does not measure input latency itself.

If you have any questions, please check Marius's Discord server (https://discord.com/invite/QcCkfbkp3S).

Can HIDUSBF be used with a REACTA (JDM-5X) controller?

The software itself works flawlessly. However, applying overclocking through HIDUSBF to the REACTA (JDM-5X) board or connected USB ports may lead to reduced performance. Please only apply the 8KHz setting through Marius' setup page.

If you have trouble setting up REACTA

If you are unable to resolve the issue after trying the steps in this manual, please contact REACTA's dedicated support via LINE.

Talk to REACTA Support

*We may ask you about your usage environment to confirm the situation.
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