How do I have MIDI inputs only affect in half of the range?

[booshtukka]

I have a bunch of pots on my DJ mixer (DJM-900NXS2) I have affecting various things in Resolume. But I can't figure out how to have them take no effect when they're in the centre.

For example, I have an EQ bass knob. In the centre it has no effect, to the left it removes bass, to the right it increases it. I'd like to map this to a control, but only when it's turned to the left - when it's in the centre I'd like it to have zero effect.

I also have a filter knob that behaves the same way. And the king of these controls, the cross-fader! This would be hugely useful. Can it be done?

[Zoltán]

Maybe with envelopes:

https://resolume.com/support/en/envelopes

Set the middle keyframe to the param's default value

[booshtukka]

Aha! This totally works! Amazing!

I was really confused for a while, because although it was working correctly, the V slider for the layer wasn't actually showing the Opacity value. Perhaps a bug?

But regardless, it works exactly as I want it to! I'M HAVING SO MUCH FUN!

[Zoltán]

Great to hear you're having fun

With an envelope enabled, you might see two green lines on the param slider.
The bold one is the parameter phase, the slim one is the actual param value.
With a linear envelope, these are at the same positions.
Midi shortcuts control the parameter phase.

[booshtukka]

What I mean is on the big V slider that I see to the left of the Layer, sometimes it is showing a non-zero value when actually the effective Opacity is zero - so I found that a bit confusing and thought I was doing something wrong.

[Zoltán]

That's what envelopes do, they modify the input curve.

[booshtukka]

I get it. I understand how they work. What I mean is, the input is modified, so the result is e.g. 75% opacity. But the big V slider shows 100% opacity. I would find it more intuitive if the V slider showed the calculated result rather than the input result.

[Zoltán]

The V slider is the input. If it would show the result, you wouldn't be able to drag it, with a random envelope.

We have draw a thin line on the parameter sliders on the panels with Envelope to show the actual modified value, we have a ticket to have it shown on the layer controls.

[booshtukka]

That makes perfect sense - and that line would make it visible. Thank you!