u-he

tomatohorse · Post by **tomatohorse** » Mon May 12, 2014 1:19 am

Is it possible to make key follow do the opposite from what it usually does? I.e. it opens up the filter more with lower notes?

I quite like this sound, and would love to be able to do it in Zebra and Diva.

Gone soft · Post by **Gone soft** » Mon May 12, 2014 2:16 am

tomatohorse wrote:Is it possible to make key follow do the opposite from what it usually does? I.e. it opens up the filter more with lower notes?

I quite like this sound, and would love to be able to do it in Zebra and Diva.

Easy enough in Zebra 2, one way of doing it:

Set keyfollow to zero. Rightclick on the knob where it says Atouch by default, the knob to the left of "KeyFol". Choose "KeyFol" from the list. Set the knob to a negative value. You have now sacrificed the default aftertouch controll of the filter cutoff for reverse keyfollow.

An alternative approach is using the matrix. Click on the first freely available "Mod", choose "KeyFol" from the list. Click in the corresponding "Target" rectangle, choose cutoff for the filter you wish to modulate in this manner. Set the mod knob to an appropriate negative value for the intended effect. Voila!

I've no idea how to do this in Diva, or if it's even possible there.

Gonga · Post by **Gonga** » Mon May 12, 2014 2:51 am

Very cool idea. Always wanted to try inverting the Osc frequency. Sort of like playing a keyboard from the back side as Zawinul used to.

xh3rv · Post by **xh3rv** » Mon May 12, 2014 3:11 am

V-GER wrote: I've no idea how to do this in Diva, or if it's even possible there.

Filters, yes - Invert 'keyfollow' on the Mod tab, and set one of the assignable modulations on the filter to Invert (at depth +64 for 1:-1 ratio).

I don't think one can reach a 1:-1 tuning ratio on oscillators, even with the tricks of doubling up an inverted keyfollow through double 'add' and double assignment to the oscillator modes that allow for that.

Kriminal · Post by **Kriminal** » Mon May 12, 2014 5:55 am

Im not sure it would work as he wants. He wants the filter to open more the lower you play. Setting neg value for keytracking will close the filter as you play higher, but wont open the filter when you play lower. You would need to have the filter fully open to start with for this to work....

xh3rv · Post by **xh3rv** » Mon May 12, 2014 6:54 am

Of course negative mod value rather than inverting and using positive mod value is equivalent

The keytracking assigned to a parameter is actually bipolar, rather than unipolar like the hard-wired keyfollow on the filter. It looks like it's centered around E2, which corresponds to filter cutoff of 64.00. Filter cutoff would end up closer to the the middle than the edges for most uses? Definitely *feels* a bit backwards.

Urs · Post by **Urs** » Mon May 12, 2014 7:17 am

Yup, key follow (the mod source, not the filter tracking knob) is indeed centered around MIDI note 64.

Assigning it as a mod soucre to anything, then using negative modulation inverts the effect: lower values on the high end, higher values on the low end.

Zebra2/ZebraHZ and FilterscapeVA have a dedicated "Keying" controls on their oscillators that can scale the frequency from -200% to +200%. Default is 100% of course.

Diva, ACE and Bazille (as well as Zebras) can furthermore have keyscaling reversed by loading a .tun file with inverted tunings.

Howard · Post by **Howard** » Mon May 12, 2014 7:41 am

Urs wrote:Yup, key follow (the mod source, not the filter tracking knob) is indeed centered around MIDI note 64.

I just did a quick experiment because that seemed wrong: The mod source 'key follow' pivots around a lower E than MIDI note 64. BTW in the manuals, I called it 'E2'.

Urs · Post by **Urs** » Mon May 12, 2014 7:43 am

Howard wrote:
Urs wrote:Yup, key follow (the mod source, not the filter tracking knob) is indeed centered around MIDI note 64.
I just did a quick experiment because that seemed wrong: The mod source 'key follow' pivots around a lower E than MIDI note 64. BTW in the manuals, I called it 'E2'.

Well I was never good at counting octaves

EvilDragon · Post by **EvilDragon** » Mon May 12, 2014 8:57 am

That's a weird pivot point, E an octave below middle C. FR: adjustable keytrack pivot point.

I usually like it at middle C, personally.

Howard · Post by **Howard** » Mon May 12, 2014 9:03 am

Correction (thanks Evil One): in the manuals it's 'E3'.
BTW maybe C4 is more common, but there's nothing intrinsically wrong with choosing E3, and changing it now could open a can of worms.

EvilDragon · Post by **EvilDragon** » Mon May 12, 2014 9:13 am

Well, middle C designation is historically challenged

Over here in most of Europe we use C3 (Steinberg, NI...). Kurzweil, Yamaha, Korg use C4. Roland/Cakewalk/FL Studio use C5... It's really ridiculous.

Howard · Post by **Howard** » Mon May 12, 2014 9:19 am

Yeah (sigh). Best to use MIDI note number instead (and maybe specify that number for A440). Heeeelp!

EvilDragon · Post by **EvilDragon** » Mon May 12, 2014 9:58 am

Exactly, MIDI note number is the way to go. And A440 is always MIDI note 69.

Howard · Post by **Howard** » Mon May 12, 2014 11:23 am

http://www.glassarmonica.com/science/frequency_midi.php is typical...
Why does each new octave start on C instead of A?
Crazy system.

u-he

KVR Audio

Is reverse key follow possible?