Thank you for such useful information!
And how do I do 9/8 and 3/4 meters simultaneously with even barlines. Just can’t figure it out.
Use a 9/8,6 pick up bar, then back to 3/4 with three triplets per bar (3:2e).
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You can for example:
Enter a 3/4 Time Signature. In the staves that will be in 9/8, enter a 9/8,6 in the first bar, and a (3/4) in the next one. Then enter your notes as tuplets:
Edit : @MarcLarcher was quicker 
Also: for the bar numbering to be correct, select the 9/8 TS, and in the properties panel, switch on Group first bar as pick-up and leave the square blank.
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However, if the majority of the score is in 9/8 TS, it is on the independent 3/4 time staff that we will need to take action, using duplets.
And in this case, what should we enter in the pop-up for the pick-up?
3/4, 4.5?
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Thank you, Marc!
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Thank you, Charles!
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According to the manual, in the pop-up, the indication after the comma follows the value of a quarter note for 4/4 or 3/4 time signatures, and an eighth note for 6/8 or 9/8 time signatures.
So 4.5 should correspond to four and a half quarter notes in a measure that is supposed to contain only three. I conclude that Dorico accepts the entry of a measure that exceeds its total number of beats. Correct?
And, in the case I am referring to, the measure following the pick-up should be 9/8 (hidden), in which we will enter duplets on each beat in order to obtain two eighth notes instead of three. Is that correct?
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Correct and correct
Yes, exactly. That is why you can easily create and use a pickup bar that holds as many quarters as needed in a cadenza, even without using the open time signature. What is important here is to use the dot instead of a comma to add fractions of the denominator rhythmic value.
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Very very interesting ; I had never thought of that, and it offers a better alternative to open time, which is not always easy to manage. Thank you very much for this tip, Marc.
Important point indeed. What the difference between the dot and the coma in the TS pop-over?
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Comma , separates the TS from the the pickup.
Dot . creates a fraction of a beat for the pickup.
(I guess the confusion may arise for localities that normally use comma for fractions?)
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I think the point is that if you’re adding fractional parts of a beat, you need to follow the US/UK convention of writing the number with a period instead of a comma (1.5 instead of 1,5). The comma separates the time sig from the duration of the pickup.
[Ninja’d by @Janus]
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Thank you for this explanation, @asherber .
I think this clarification will be of great interest to many users. Very important because, in many countries in Europe, (number entries in Excel for exemple), the coma is needed for the fractions ; for exemple, 135,45€ and not 135.45€.
So, your explanation will prevent any error.
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