Use LED as signal meter: control LED brightness with midi CC (midi rx)

I would like the LED brightnes reacting to the peak level on a audio track in ableton. I'm using BlueCat DPMeter to generate midi CC values and send them to grid. I see the events in the midi monitor in grid editor. (CH16, CC, Ctrl. 0, (vu values 0-127).
now how can i change the led brightness of an element with this information?
i tried the following code in the system Midi rx page, but it doesen't work.

led_value(4, 1, param2)

the led numer and layer are correct, when i set param2 to 0 or 255 the led changes brighness accordingly.

Replies (5)

narayb · September 5, 2025

Yeah, MIDI RX has been deprecated for a while now.

narayb · September 5, 2025

There's an alternate way of working with RX now, it's using a small bit of code to achieve similar results.

narayb · September 5, 2025

You could use the snippet called: Basic MIDIRX in the cloud to try it.

erhalder · September 5, 2025

thanks, it is now working with the self.midirx_cb command i i got the leds flashing now. thanks!

narayb · September 5, 2025

Cool stuff!