TR-8S, TR-6S: Can I adjust the brightness of the sliders and buttons?

Yes.
Perform the following procedure.

1. Press the [UTILITY] button.
   - The setting screen appears.
2. Use the [VALUE] knob to select “LED: Bright,” and press the [ENTER] button (TR-6S: [VALUE] knob).
   - If you select “Grow”, you can adjust the brightness brightness of a dimly lit button LED.
3. Use the [VALUE] knob to change the value (Range: 1-10).
4. Press the [UTILITY] button to return to the previous screen.
   - To save the settings, you need to perform the WRITE operation. See also the related Q&A below.
   　　　WRITE operation: "Can I save the settings of the knobs?"
   　　　Auto Save: "How do I save Patterns or Kits?"