Chords not in the key

[racecube]

Sorry if this has already been covered (I'm new to the NDLR I couldn't find out).

Can a chord that's not in the key of the song be used to replace a current one?  For example we play a song in the key of B but there's also a A major in there too.  If this is possible - can it then be saved as a preset as such?

Thank you for any info.

In my opinion this is not possible, but of course you can change the scale via MIDI and in the new scale choose the appropriate chord