There seems to be an issue with the way how hue is calculated there.
I’m not entirely sure why it’s done that way, so I replaced that logic with the normal rainbow logic and combined that with the theater chase.
Thanks ScruffR!!! (again). It’s working well… 
This project isn’t complete, but the core functionalities are there so I put together a GitLab repository for it here:
https://gitlab.com/sleeplesswaves1/rgb-led-light-controller
It has firmware for the Arduino Pro Micro with communication over serial, and the Particle Photon with communication over WIFI.
I’ve also included 3D printer files for a little enclosure for both microcontrollers, designed in Fusion360.
I’ve also included MaxMSP patches that provide a control interface for the RGB LED strips. Currently it supports 12 UDP strips and 12 serial strips simultaneously. I haven’t tested more than 4 UDP & 2 serial at the same time though.
A remote MaxMSP patch allows for the master patch to send data to up to three remote patches running on different machines. Right now the remote patch allows for serial connections.
I have some Argons around, do you know if this same code will work on those, or do I have to modify?
Thanks!
It should work as is.