should keep atlantix and i kick out dixie and buy another vco?
I think the Atlantix will be great for your system because it has a lot of possibilities that you otherwise don't have:
- Through-zero FM with set ratios
- Bandpass
- ADSR
- Sample and hold
- Noise
Never underestimate simple noise. It makes your filters sound gritty, introduced instabilities, and noise+a/d envelope+vca=rudimentary hihat. Sample and hold introduces stepped random anywhere in the system. I would say that both are necessary building blocks, useful in any system.
Shapeshifter is a really good sound source and would suit techno and ambient patches.
another VCO or shapshifter, should i buy with it a separet filter and adsr
I feel that you need at least one filter per VCO. Often the filter adds more flavour to the sound than even the oscillator itself. Even in your current setup, I would prefer one more filter. You may want to filter an effect, the Basimilus, etc. I have two VCO in my own system and four filters.
An ADSR is great if you will be playing on a keyboard. If you are only using the sequencer, Maths can make an ASR. You have enough envelopes with the four AD from Quart and the two AD/ASR from Maths.
So without the Atlantix I would go for : VCO, 2 filters, ADSR only if keyboard, some kind of noise/S&H source like Noise Tools 1U Intellijel.