show different notes feedback on same led Fastled

[MoSaye]

hello there,

I have a key matrix that sends notes and a strip of leds ws2812, the matrix is banked and i want the leds to show multiple notes on the same led, so for example button 1 sends c4 on bank 1 and c5 on bank 2, so i want the first led on the strip to light on c4 and c5 feedback, is this possible and if yes how can we accomplish this.

thanks all