First, you can interface your 0-Coast with rings and any other eurorack module without any line-in/out level shifting. Most Semi-modular fits the eurorack standard, it’s when you want to get in or out of eurorack to other gear where it’s more complex.
I assume you want to mix the 0-Coast as one voice and Rings as the 2nd voice. neither of them have stereo. So you would need something to mix those 2 mono signals into a single mono signal.
The setup you describe would work great, i’ll break down a couple things…
- Quadratt 1U (my fave 1U, you’ll find use for the other 2 channels for sure. iIhave one in every case I put together)
- Duatt 1U (Quads’ little sister, my pref is still Quad)
So you got a mix, now you need to take that signal and bring it into into the Voltante, you will need to bring the Level down from Eurorack levels (very hot).
If you just need to get that mono signal out, then you can run it with a ¼" to ⅛" cable from the Duatt/Quadratt into the left input of the Voltante. You’ll need to attenuate the levels on the Duatt/Quadratt.
If you want to take advantage of the ¼" case jacks, you can do that a few ways…
As you mentioned… If you want balanced outputs, then Stereo Line Out 1U will do the balanced AND level conversion. (Note the Voltante will not take advantage of balanced connections, but your interface/mixer probably does)
Other cheap passive option is the the X/Y module. You can patch the attenuated signal from the Duatt/Quadratt into X on the X/Y, then take a ¼" cable and patch from the palette to the Voltante.
Hope that helps. We can talk more here, or you can PM me anytime, here instagram, where ever.
[edited some draft text off the bottom]