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Attached below is basic demo of polyphonic piano using PSoC5 (CY8KIT-059) as processing unit and MIDI Keyboard as input.
This is very basic demo to demonstrate interrupt-driven DDS technique with signal output to 8-bit VDAC. The project is heavily using CPU and interrupts (Arduino-style) and doesn't have any "advanced" features (DMA, etc), but it is good for introduction.
Attached are: project demo, project screenshots, related Cypress application note and YouTube video.