Matrix sequencer LED feedback
Hi.
I am trying to build an 8x8 step sequencer based around the matrix object, with visual feedback from WS2812B leds. I have just sort of managed to get the columns to light up as the counter moves through them, by each led in the column lighting then being turned off quickly, it looks pretty hectic and you can tell that the top one happens before the bottom I think, but my problem is... Now when I press a button to select a matrix cell, when the counter comes past that cell, it now clears the led so you cannot tell the button is pressed!
I have seen great examples of these sequencers online:
https://www.gridi.info/
But I just cannot work out how they are made. Can anyone offer me any advice or point me to any resources. My patch for the led feedback is attached, I cannot attach the arduino .ino for some reason. Thank you in advance.