Thanks for the quick response!
When using SPI2.send4bit(arr, 0b0001, 0b0011); (i'm using pin B15 as the data line) in stead of require('neopixel'), i' getting the same behaviour als with neopixel (so gradually worse along the line with varying degrees for every send command).
SPI2.send4bit(arr, 0b0001, 0b0011);
When using SPI2.send4bit(arr, 0b0001, 0b0111); i get random leds lighting up (random color, intensity, address) so that seems to break it :( .
SPI2.send4bit(arr, 0b0001, 0b0111);
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