Patch of The Week: Stereo Gemini - Using a Dual Filter to create Stereo Effects

This week's patch shows how you can use the Gemini 2412 VCF (otherwise a twin or 2 filters) to create stereo panning effects, by using an LFO and 2 VCAs. It's easy to create stereo amplification or panning of a sound just by using a pair of VCAs in the same manner as detailed in this video, or just in post-processing, but where's the fun in that?? Actually filtering and shaping the sound in stereo, using two filters that can have completely unique settings, is much more sonically interesting, and offers a huge range of sound possibilities.
The Gemini 2412 is perfect for this kind of usage, as in addition to providing 2 completely independent SEM-style VCFs, it also has a very flexible mixer section allowing the two filters to be used and controlled together, in parallel or in series. With Low Pass, Band Pass, High Pass, and variable Lowpass-Highpass filtering modes, all selectable by a switch, and with individual outputs for LP, BP and HP - it provides almost limitless tone-shaping possibilities.
00:00 Intro
00:12 Overview
00:46 Setting up a stereo patch
02:43 Some patch examples
05:30 3-Way Modulation patches
08:31 Patch Sheet (Basic Setup)
08:46 Patch Sheet (3-way modulation)
Patch Sheet PDFs
Basic setup: kvisit.com/8AE/3fYG
3-Way modulation: kvisit.com/8AE/3vYG
(Patch Notes duplicated further down the page)
Check out the AJH Synth playlists for more 'Patch of The Week' videos, which will be either performances or 'how to' guides detailing a range of sounds, some familiar, some less so, and each containing a patch sheet at the end to show you how to construct it for yourself.
Video by / dreamsofwires
More Videos:
Mini Mod with Muting Mixer performance: • Patch of The Week: Min...
Introducing the MUTING MIXER & VCA: • NEW! Muting Mixer by A...
PATCH NOTES: Basic setup (taken from patch PDF)
----------------------------------------------------------------------------------
Green dots show approximate pot and switch positions, and where there are two dots shows the range I move them during the performance. Pots and switches that do not have green dots are not used in this patch, and should be left at their zero or off positions.
This is just the basic setup for using the Gemini in stereo, but you can connect any modular-level audio signal to Input 1 of the Gemini to produce the same stereo effect for the incoming sound. I only use 1 VCO here as a simple example, for the sake of demonstrating the patch, and showing how effective this method can be.
VCO Tuning: I had a keyboard connected to the VCO via the CV Bus, which set it's base pitch, but it's not necessary for it to be connected to anything, just tune it accordingly by ear.
VCA: I'm using both a Discrete Cascaded VCA and a Muting Mixer & VCA to create a stereo pair, but any combination of these two can be used. You will need to find suitable and balanced output levels depending on your own setup, starting with the input levels very low and increasing to an optimum level.
Audio Out: Take the two output cables to separate channels on your mixer or audio interface, then pan them both to 100% left and right respectively to get the widest stereo effect, or reduce the degree of panning for a more subtle stereo effect.
Modules used: Vintage Transistor Core VCO, Dual LFO, Gemini 2412, Discrete Cascaded VCA or Muting Mixer & VCA (x2).
#ajhsynth #eurorack #modularsynth
Tags: MiniMod modular synth patches modularsynth analog modular synth patching analogue synths eurorack modular synthpatchers patch breakdown how to instructions and guide stereo modular stereo patching phaser effect make 1 VCO sound huge

[@JuanAMatos-zx4ub]

This modules is so deep, you could do a whole series on it. Great stuff as usual!

[@AJHSynthOfficial]

Thank you very much, glad to hear you like it.

[@vincentprimault4380]

Gemini is my favorite filter.

[@klstay]

As elsewhere requested, a whole series on this filter please!

[@AJHSynthOfficial]

Working on some more now, possibly one for Sunday. There's just so many possibilities with this module.

[@lockyp204]

Such a beautiful filter 🔥