dundakitty

I haven't had problems with the higher data speeds of the APA102 or SK6812 LEDs. My Infinity Mirror Clock has a string of 120 APA102 LEDs, updated 120 times a second. My Ring Clock has a strand of 276 APA102 LEDs and a second strand of 222...

I've used a TXB0104 breakout on many projects to control APA102 LED strips without problems. One example is my Infinity Mirror Clock

You could try using analogWriteFrequency() to adjust timings. See td_pulse for details. For your example of using pins 1 through 6, pins 2 and 3 share a timer on Teensy 4, so using analogWriteFrequence() on pin 2 will also affect pin 3.

The two blobs are for when you change your mind and want ADD tied to ground. You can then bridge the two blobs with more solder.