I've released the 6th product under the TurboLEDz name. This time it is a voice changer. It makes you sound like a bad asss, by doing real time FFT, frequency manupulation and iFFT to go back to the time domain. It's built with an I2S mic and I2S DAC/Amplifier. To make the μcontroller capable of keeping up with the samples, I've programmed it as multi-threaded, dual core. So if one core is busy doing math, the other is still available to do IO. And the cores will tag-team. One core for the even numbered chunks, the other core for the odd numbered chunks. It works really well, as you can see in the video.