What I couldn't find was a simple synth to create my own click tracks with. I can play to; but prefer not to play to the old "1,2,3,4"
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For this I often use the midi drum parts from PowerTracks, the ones used for Fill Track With Drum Pattern. I think they are also inside the RealBand folder under Drums. And, sometimes the free drum midis from Groove Monkey. I simply drag them into an empty track in Reaper and try a few until I get a basic pattern to record or practice to. I'll initially have that track feeding a track with the TTS-1 on it. Or, put SI Drums on that track. But, SI drums is not full GM midi. Meaning; it does not have each and every drum sample that the TTS-1 has. No bells for example. So, I'll eventually use the SI Drums for a basic kit and make a second track for shakers, bells, etc, running through the TTS-1.

Does the noise in your head bother me ?