Thanks again, Trent.
Using PWM Pin 18 on Pi Zero and it works for two strips in series. Among other things, installed Raspbian Bullseye on the Zero. The python script here does not work with Python 2 anymore. The script changes the default of the command “python” to python2, but have to use python3 as root to run this. Also, had to use pip3 install of the Rpi_ws281x python repository instead of pip to get it running. Hope this would help anyone upgrading from Buster to Bullseye.
G
