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Thanks for clarifying, Vasilis — I misunderstood the obstacle as the audio recording rather than the video's room sound. Since you already record into GarageBand/Pianoteq, one option is to film the same performance and use its GarageBand export as the video's soundtrack. Align a clear first key strike in both recordings, check alignment again near the end, and mute the camera audio. That keeps the actual performance while leaving mechanical keyboard noise out of the finished soundtrack. If you use iMovie on Mac, Modify > Detach Audio separates the camera's audio so it can be removed after alignment: https://support.apple.com/en-mt/guide/imovie/mov267936bb2/mac A short test would tell you whether that is practical with your setup, without committing to filming a whole sonata.