@thendrix I believe it's in the SoC or GPU code. I know that with QCom it is usually in the weird thing called Hexagon. It's like a GPU doing DSP instructions and using VLIW instructions.
With an AMD CPU I believe it has a DSP for audio on the die and Intel should be similar. If it was a comment about it not being implemented then it should be possible to pipe the audio and process it in real time. I presume it would take hardware calls or modified permissions.