Hey guys,
first of all: thank you very much for your great work, which helped me a lot in the past! 
I’m currently working on a lightning installation, based on Processing running on an Orange Pi, which analyzes music and gives information on lightning to an arduino, which sends the data over a 433MHz RF module to another arduino, which controls 6 10W RGB LEDs and some stepper motors.
The part, which gives me headaches, is multithreading the second Arduino. I thought of working with a Nano v3.
It should receive RF data continuesly and control the 18 light channels (6x RGB) through some shift registers, plus the stepper motors through another shift register.
I found the library ShiftPWM to be very powerful to control the LEDs.
Example:
When ShiftPWM fades some of the LEDs, it's bound in a loop.
While fading, I want to give over RF the command to fade some more LEDs and turn some steppers.
Problem:
Because of the loop, it can't receive the command and could not control the other LEDs as well as steppers.
Question:
Which is the best way to handle the multithreading?
Is it possible to do this with something like ArduinoThread?
Or is an object-oriented approach more suitable? Like with the Cosa platform? I tried this one, but I would have to port ShiftPWM to Cosa, which looks like a lack of work to me.
Or is there any other way to solve my problem?
Thank you very much for your time and thoughts!