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.


Why is it that doctors call what they do 'practice'?
If flying is so safe, why do they call the airport, the terminal?

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware