LED FEEDBACK IN SESSION BOX = LED BLINK DURING PLAYING

Hello everyone

I have a midi interface whose ledfeedback works in a basic way with single-color LEDs

Note ON = velocity 127 the LED lights up

Note OFF = velocity 0 the LED goes out

I configured a session box, the LED feedback works, the different functions that can be configured via the software

But what I would like to do is that when a clip in this box is playing that the corresponding LED starts flashing at the tempo for each clip currently playing

I understood that this was possible via reactions

How to do this ?

thank you in advance for your help