I’ve spent some time today figuring out how to arrange OSC 1 and OSC 2 with their ‘5th Sub’ to give 4 note chords that are in key.
The ‘5th Sub’ gives you a note a 5th down, meaning if you hit a C note on the keyboard, it’ll give the C and an F below… which is the foundation of an F chord, not a C chord.
So, the way around this is to tune your OSC to +7… this makes the 5th Sub sound a C and your OSC sound a G.
C - G = root and fifth. Wherever you play this on the keyboard now, you’ll have the right root note playing.
Once you have this set up, you can turn to OSC 2 and use this to create chords.
If you want simple 3 note chords, you can keep the Sub off and tune the OSC to the usual settings for intervals;
+3 for a minor chord
+4 maj chord
+5 sus chord
Etc…
Where it gets more interesting though, is using the OSC 2’s 5th Sub too to create 4 note minor 7th’s, major 7th and other altered chords.
I thought I’d share my notes for anyone who wants to experiment.
OSC 1 stays the same in all examples, just OSC 2 changes. And remember, once you have this setup in C, you can use it in any key and know that it’s right.
OSC 1
- Tune +7 = G (5th)
- 5th Sub = C (root)
OSC 2. Min 7 chord
- Tune +10 = Bb (min 7th)
- 5th Sub = Eb (min 3rd)
OSC 2. Maj 7 chord
- Tune +11 = B (maj 7th)
- 5th Sub = E (maj 3rd)
OSC 2. Sus4 or 11th
- Tune +12 = C (root)
- 5th Sub = F (sus4 ( or 11th))
OSC 2. 6/9 (no 3rd).
- Tune +21 = A (maj 6th (or 13th))
- 5th Sub = D (maj 9th)
Once you have this, it’s easy to use Trig-locks to create chord progressions as simple or as complex as you want.
Another really cool trick;
If you set up for a Minor 7th chord you can use a Perf macros knob on OSC 2 pitch/tune. If you set it to a value of 2, it gives you 3 easy chord positions on the Quick Perf knob.
Fully left- Minor 7th
Center- Major 7th
Fully right- Sus 4
This makes C major to E minor moves, for example, really easy to do.
Anyway, enough music theory nerding from me, hopefully some of you will find this helpful/interesting. 
