Pixelblazes are the tool for the job, for sure!
Buy a pixelblaze along with a sensor extension, and this.
Power the pixelblaze via micro usb into a wall charger, and play around. That’s the fastest way to wrap your head around how overwhelmingly powerful they are!
The pixelblazes can indeed divide the frequency up and pick which ones to listen. 100hz to 10,000hz broken up into 24 sections if I remember right off the top of my head… Aside from that, the sensor extension have a 3.5mm jack that ought be perfect for your purposes!
“little guidance one how to sync multiple led controllers together?”
Firestorm, or the pixelblaze library!