Different tunings than A=440

I would like to know if it is possible to change the tuning of A to say 432 or 415Hz. In the tuning systems dialog it seems the A is always fixed to 440, and there’s no way to change that. I’m interested in changing the tuning in the middle of a flow, the way Jacob Collier does, for instance.
The only workarounds that come into my mind are:

  • Create a hidden accidental that shifts all the notes from A to G and put it in a key signature. Create new accidentals that are identical to the ones in use for A=440 in shape, but which include this shift in tuning. It could be created with a new tonality system to simplify things, although the inability to currently copy accidentals from one system to the other makes this process more tedious, especially if one has a lot of alterations in its tonality system!
  • Create a different tuning system in which the divisions between A and B and between G and A reflect the change in tuning for all notes except A, and use a single hidden accidental for the note A. For instance, if I have a 1200 EDO system (cents) with A->200->B->100->C->200->E->100->F->200->G->200->A, and I want to shift everything down 20 cents, it would be A->180->B->100…F->200->G->220->A. That way, only the note A would be in 440. This reduces the amount of fake accidentals to just one note.

You can change the tuning (the frequency of A4) on the playback option dialog’s tuning page.

Thank you for your response, András

What I’m looking for actually is a way to change it within the score. Jacob Collier has an example of this here (at the rehearsal mark H)
https://youtu.be/7-nRv0uQvH0?t=255
I think being able to change the playback tuning in the middle of the score, but I guess that’s not possible at the moment in Dorico.