i also have a plain raspberri pi 4 + HiFiBerry DAC thing with a case that i've been messing with because arm64 and more memory, and it is turning out nicelyyyyy. added a fan to the case and overclocked the processor. tbh i just LOVE having something that sounds almost exactly like a real grand piano, have had to take off my headphones to check that my amp is not on accidentally because it ~feels~ real