If you've used both built-in 12 bit DACs on Teensy 3.5 or 3.6, what was your application? Anything other than stereo audio?

Or what sort of uses would you have for 2 (or possibly mode) DACs on hypothetical future boards?

I know this is a sort of vague and rhetorical question, but being able to showcase real applications truly needing both DACs would *really* help me soon. Please let me how if you've used both of them, or plan to do so? Or what sorts of valuable applications would 3 or more DACs open up?