The code of the DIY amplifier has grown much, it is harder and harder to debug it and keep in the order. So first of all I have added the audioprocessor part to the existing code, not much to discuss it is already been considered. Only one thing – I added the display LCD functions instead of the uart menu. I still want to have the USB connectivity so I can take control over amp from the PC. The plan is to use the FT232 with the virtual com port. Of coarse, it would be a nicer way to use PIC18 with USB on-board, but at the moment of time I did not have the experience with it, and now, when I actually have it – I would still go the virtual com path, usb has too much of the hustle to implement and handle nicely, besides it is not free for use as usual usb.