Hello, I am looking for some input or direction to links that could help

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Hello,
I am looking for some input or direction to links that could help me out. I have a wearable light project. I am using a Teensy 3.2 and Bluetooth to send commands from my Android phone. The lights I am using are WS2812B. I am currently using the Adafruit_Neopixel Arduino library but want to change to FastLED. I understand that FastLED is faster and more capable. I currently have four light patterns and want to add more. The interface I have from my phone to the Teensy was made using App Inventor. Basically I press a button on my phone that sends a signal stating which pattern to run. I am using code from Adafruit that works with multi-tasking. (reference https://learn.adafruit.com/multi-tasking-the-arduino-part-3/overview?view=all) This code is useful in that I can “interrupt” code mid run and have minimal lag.
So, the help I am looking for is how can I add multiple patterns / sketches in to one sketch and control it from my phone using FastLED and not have any lag from changing from one pattern to the next? I have searched for FastLED and multiple sketches in one but have not been successful yet. I want the multi-tasking abilities and not have to deal with the issues the multi-task article describes regarding interrupts and having to wait for the cycle to complete before the command is recognized and implemented.
Thanks

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Generally WS2812 style LEDs don’t play nicely with interrupts.

APA102C style LEDs are less of a problem.

I’d actually suggest using @Jason_Coon ​​’s tree code on a WeMos D1 mini. The controller is cheap and powerful and supported by FastLED. And there’s a li-ion battery controller shield available.

The just set up the WiFi to log onto your phone’s hotspot and away you go. No android code required :))

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Have you looked at or tried the DemoReel100 example? https://github.com/FastLED/FastLED/blob/master/examples/DemoReel100/DemoReel100.ino

It shows an easy way to include multiple patterns. It switches automatically at a regular interval, but this can be modified to change on a button press, wi-fi request, BLE, etc.

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Thanks Jeremy, but my project already exists and I prefer not to change any hardware at this point. The Adafruit multi-task code works pretty well but as I mentioned I want to use FastLED.

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Thanks again Jason. I have looked over the Demo Reel and I think there may be things I can work with there. I need to figure out how to get the code to see input. That is the reason why I posted my other post about commands used in FastLED. I am a beginner with coding but do have people to assist me at my local maker space when I come across bumps. My initial thought with the DemoReel is that I could change line 57 from timing to “see” input.