Reaper has a plethora of built-in effects and you can script your own in JS or Python or EEL2. You'd have to use third-party synthesizers though. That said, th

Reaper has a plethora of built-in effects and you can script your own in JS or Python or EEL2. You'd have to use third-party synthesizers though. That said, the GUIs of said effects are basic, but I personally still find them useful. There is no difference between the evaluation, non-commercial and commercial tiers. I'd say, give it a try, the days when Reaper was a niche DAW are way in the past. Especially if you like the idea of being able to customize every corner of your DAW, Reaper is the no-brainer choice.