Different clefs in the same staff

[Phroso]

Hello
How can I ensure that the note remains at the same pitch in the F clef when I add a second voice in the G clef in the same staff?

Thank you for your solutions.

[MarcLarcher]

I remember I had to fake it in Poulenc’s Chemins de l’amour with a dummy G clef (as a playing technique ? I don’t remember). Of course it would sound wrong (so suppress playback and add the right note in an added staff, then remove that added staff), but the looks of it was perfect.

[Derrek]

Can the tied note in question have its (playback) length extended in the Key Editor?

[Phroso]

The first measure is correct. How can this be extended to the following measures? Especially since, from what you write and from consulting existing posts on the forum, piano literature is full of this type of notation.

[charles_piano]

As @MarcLarcher was saying, you must fake it. Enter the 4th beat as D-A in bass clef, and add a treble clef as text or playing technique (playing technique here, using the treble clef symbol scaled to 75% — which is the default in Dorico for middle staff clefs.)

[Phroso]

I’m sorry, excuse me, but I don’t understand the trick. I don’t see a treble clef in the playing techniques.

[asherber]

You have to create a custom playing technique.

[charles_piano]

Sorry, I was not clear enough. It doesn’t exist but you can create it:

As you can see, the Playing Technique will show up in the right column once you’ve created it, and you can also choose its popover keyword.

[Phroso]

Ah, right, that’s clear now. Thank you for your patience and your helpful explanation. It’s sorted.

[es560]

In simple cases like this, it makes more sense to add the voice to the upper stave. This is clear for every piano player – even without the addition of m.g.

For more complicated cases switch to a 3-staff-piano.

If you want (or must) to use your notation, @charles_piano showed you the solution. I don’t know if there is a rule for this, but I would stick to Durand and Henle and mark the lower voice with an additional clef (use a playing technique).

(From Debussy / Préludes / 1ère livre / No 2, Durand and Henle editions)

[Phroso]

Before reading Charles’ solution, I wrote the left-hand part in treble clef as es560 explains. Now I have two solutions to solve this problem.
Thank you all for your support.