I spent a lot of time searching for a neat way to deal with the active low outputs to the Tiny 2040 RGB LED. Here it is:
from machine import Pin, Signal
rled = Signal(18, Pin.OUT, invert = True)
gled = Signal(19, Pin.OUT, invert = True)
bled = Signal(20, Pin.OUT, invert = True)
rled.off()
gled.off()
bled.off()
rled.off()
Off and on are working the right way round!