Comment 8 for bug 872006

>Mixxx has no concept of a focused deck to reference in the library.

what is focused deck? the one which is currently playing?

>Mixxx has s concept of a current Track which is displayed In the window title. That can be used.

exactly!

>The user must be able to explicitly set the deck or their library could filter in a way they don't want.

pioneers don't have that feature, i believe.

>start with Current Track for now and expand later.

once you have current track, you may use something like this to find the tracks with compatible key: https://mixedinkey.com/harmonic-mixing-guide/

i understand you may already know that. i am just afraid that may be you'd consider compatible track by only the same key. the key may be different, but they might mix well.