Hi there everybody. Here is my typical first post / noob question.

What about starting my modular with this sequenced by Beatstep Pro? Am I going wrong, or missing something important?

Thanks.

Some kind of Envelope Generator?

Yes absolutely, I am hesitating between these three:

https://www.modulargrid.net/e/doepfer-a-140
https://www.modulargrid.net/e/doepfer-a-143-2
https://www.modulargrid.net/e/intellijel-quadra

Could you give me some advice about which one to pick?

I don't need full adsr on a modular and would go with the Quadra from your choices, but the Doepfers are solid too.
The Doepfer modules need to receive a gate signal to go through all adsr stages, a short trigger is not enough.

Ok, I like Quadra too, but its a bit expensive for my budget. Do you know similar modules or any other interesting ADSR?

I'm doing something similar using two of these, which give you a built-in VCA:

https://www.modulargrid.net/e/steady-state-fate-adsrvca

But, in europe is even more expensive two of these ADSRVCA than Intellijel Quadra.

You don't need two. : )

There are so many great options. I would say Math is hard to ignore for a small system.
If you are into Doepfer check out A-171-2 VCS, if you can DIY check Befaco.

Agree, Maths will be the first module when I start the second row.

I would prefer a pingable LFO. The Doepfer is really big and not really cheap according to what he can do. And he's missing S/H, which I couldn't live without!
Apart from that, maybe you can choose the Double VCA produced by Doepfer, which isn't much more expensive.

Peaks? U get either or:
2ADSR
2AD
2LFO
808 BD&SD
Delay.

For the HP is pretty unbeatable. The only possible downside is the lack of CV inputs for the knobs.

Peaks? U get either or:
2ADSR
2AD
2LFO
808 BD&SD
Delay.

Yeah! Peaks is the killer!!!

Peaks seems to be perfect so I've modified my rack.