Passing this along so maybe this will help others. Like many of you, I'm using Reaper for my DAW but it's metronome functionality is a little lacking in some ways. You can get more than quarter notes if you trick it using a single tap delay but what if you need something else? I wanted to tighten up my rhythms in my SAWC Week 8 challenge but the rhythm was triplets. What to do?
As it turns out, the answer was using this website: Metronomer - Click Track Generator You specify the BPM, time signature, and beat length and it will generate a MP3 file click track. Once you have that, import it into your Reaper project as a media file and place it into a track. Voila!
There might be additional options on the web but this definitely worked for me last night.