TBH … this doesn’t exist … there is no musical “instrument”, which can do the creative work by itself and prevent mistakes.
For creating beats it takes more, than the usual synth. There should be polyphony and multitimbrality.
If there is one synth only at least some kind of multi-track recording device or a looper should be used with the synth, to create the beat layer by layer.
IMO the closest thing to support a beginning and evolving beat maker would be:
- for groovy, laid back/driving, much human touch and feel beats: MPC
- for techno, more straight on the grid beats: Elektron devices or other step sequencer supported instruments.
It’s easy to get ones head around the MPC, it doesn’t take to dive deep at the beginning, just switch it on … get a kit loaded from the factory library … and play the pads …
There are quite some interesting features for assistance:
- quantization, swing, and metronom
- performance mode with many scales, cords, and even a couple of cord progressions … select one, just play the pads and because this is already made to fit a particular mood or style, even an untrained aspirant will generate nice music in short time.
- there is even the function “Pitch Quantize”, which forces any notes played to scales
- a decent sample library ready to load quality samples, kits, and entire demos
But it would be a good idea to get into music theory as well, and understand at least some basics. It doesn’t hurt and it can open doors …
And as so often, also the secret with Elektron, MPC, etc. is
… surprise …
practice, practice, practice …