It’s quite easy to fake it now with the extra control and customizability of the line tool. To make, for instance, an incomplete triplet with two quarters in something like 2/6 time, do the following:
- Input your time signature and desired pitches.
- With two quarter notes selected, open the line tool.
- At this point, you could go in two different directions, one where you create a new line from scratch, one where you repurpose one of the premade ones. I usually do the latter, usually “Solid line with inward-pointing hook” since that’s what you eventually want. It’ll need to be reversed though.
- Input your desired line and, with it still selected, click on the pencil at the bottom of the list to bring up the line editor dialogue.
- In the line editor, you’ll need to adjust the length of the hook to 3/4. And if you’re making your line from scratch, go with a “solid line body (thin)” since you’ll need a line of 1/8 width.
- Go to engrave mode.
- In the Engrave menu, select “Font Styles.”
- Find the font style for “Horizontal Line Font.”
- Change the Font family to Bravura, and set the size to 20 (keep it on staff relative).
- Apply that and go back and select your line. Open the Properties panel.
- Go to smufl.org/version/latest/range/tuplets/ and copy the number you need.
- In the properties panel, flip the switch on the “Text” property and paste the character you just copied.
- Still in the properties panel, flip the “Erasure padding” switch, and set L and R to both 1/2 (*note: this property is only available in engrave mode).
- At this point, you should have a pretty darn decent looking incomplete tuplet. If you want to make it fully functional, you’ll need to input a hidden tempo change at the bar where the irrational meter starts and then another where it ends.
P.S. You may also want to adjust slightly the positioning and length of the thing in engrave mode. Regarding a downstem side tuplet, leave the start offset where it is, but for a tuplet above, change the start offset X to 1/2. I’m not sure what the Y needs to be as, sometimes, depending on what else is in a measure, the line isn’t always in the same place, but in a vacuum, where, say, a fake split tuplet and a real tuplet are the only thing in a measure, a Y of -27/64 seems to put it in just about the right place. The Y component needs to be set for both the Start and End offsets.
Looks like a lot, but I promise it’s easy
www.youtube.com/watch?v=t-BFjkB3GKY - This jumps around a bit and things sometimes magically appear, because I cut out the bits where I was figuring things out, but hopefully it should be pretty clear.