I’m fine with programming the mcu’s. I do that all the time. It’s a pretty specific application so it will need pretty specific firmware . It’s really just the driver I have been a bit stuck on. I’m driving 18 XM-L color LEDs, so 54 7135’s which will be sequenced very quickly. It’s for a hologram application. I’m a bit surprised there aren’t more IC’s like the 7135 by the usual subjects ie. TI, Analog Devices, Maxim etc. Apparently the 7135’s at Mountain Electronics isn’t the raptor claw version but maybe that’s all that’s available out there for now. Maybe using a series FET inline with the LED would work ok at high pwm frequencies with the sailboat version 7135.