I'm a mostly self-taught composer working on an opera that sets a prose text. The time signatures change wildly to reflect speech rhythms. I am writing it for now in piano/vocal with lots of instruments indicated textually. I came to a measure where I have vocal line and bass accompaniment, but no treble line. The measure is in 13 32. The treble line has a 16th note downbeat for a chord with the other lines. I decided that for the rest of the measure, I wanted the treble line to be three steady pulses, all the same length, without a rest. I think this may require a tuplet to write properly on the staff in the given time signature, but this is a moment where my training isn't up to the task I have in mind. If anyone can help, I'd appreciate it. There are tuplets throughout the score, but in this particular case, I'm having trouble measuring it out properly.