Thankfully it’s a lot easier than that – and that method would likely result in quantized (read as: stepped and stiff) values and take a lot of time to construct and crossfade. You can actually get much smoother and more fluid motion all in a single patch (presets are synthesizer patches, but you can also make your own), even if you do decide to crossfade between a patch or two (another valid synthesis technique).
If you want, you could make a sound design fundamentals thread (unless it’s specific to Reaper) and I’m sure a lot of us would try to help you get started and demystify concepts. There’s never a question that’s too simple to ask about, and it helps other people understand concepts, too 
Psych, I created one if you want to spitball there