An instrument tuned to A-432 hz and one tuned to A-440hz would be 0.32 semitones apart; see here

https://users.utu.fi/jyrtuoma/speech/semitone.html

So yes they would sound terrible it played together. In your case you would have to tune your guitar to A-432hz.

Actually my wife's old upright piano is tuned to A-432hz to reduce the tension on those old parts; I mean the parts of the piano and not the wife grin.


The fitness trainer asked me, "What kind of a squat are you accustomed to doing?" I said, "Diddly."


64 bit Win 11 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware