How to cross fade between samplers with a knob control

[nick]

I have two samplers, one containing a deck of close miced stuff, and the other containing another deck with the second mic that was placed further away. I would like to make a knob control, that when on 0.00 is 100% sampler 1, and when on 1.00 is 100% sampler 2. So a Mic Distance knob if you will, that is actually a cross fader between samplers.
Could anybody give me some clues on how to do this in HISE? Great product by the way, really love it so far!

[d.healey]

Is there a reason you've chosen to put the two mic positions in separate samples instead of combining them in a single sampler - http://forum.hise.audio/topic/75/multimic-samples

If you combine them my general purpose mix mixer script will be a good starting point - http://forum.hise.audio/topic/312/general-purpose-microphone-mixer

If you still want to keep them separate then you just need to link a knob to the gain parameter of each sampler. Or you could add a constant modulator to the gain section of each sampler and link your knob to that. Basically there are many ways to do this.

[Christoph Hart]

Yup, I'd definitely recommend using multi mic samples too. But using constant modulators will not work, because mic positions get the same modulation signal.

This is an example that fades between a sine wave and a noise generator. I also added a table that you can use to specify the crossfade curve - depending on the coherence of your mic signals, it might need some adjustment to make a smooth transition:

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If you want to adjust it for your setup, just put the two SimpleGain effects in the Sampler and set it's routing matrixes accordingly.

[nick]

Hi, thanks all for the information. I have now used the multimic system. It works fine :-)
Two more auestions. The code for crossfading is now this:

function onControl(number, value)
{
switch(number)
{
case micDistance:
gainFx[0].setAttribute(0, 0 - value);
gainFx[1].setAttribute(0, -100 + value);
break;
}
}
Where the knob value goes from -100 to 0. This linear gaining howver, results in them both being -50 when the knob is in the middle and is almost silent. Is there a math formule I could use to exponentially decrease or increase the gain? Sorry if this is a newbie question, I was never really good at math (but have been a software developer for almost 15 years now).

To compile a vst, I can't seem to download Visual Studio Community 2015 (Needed to log in using my microsoft account to download the older 2015, but when I get to the download page for the legacy products, no items are shown). I am able to download the 2017 Community edition. Will it work with that version?

Again, awesome work. Really love HISE!

[Christoph Hart]

The problem is that you are using the decibel scale in a linear fashion and -50dB is basically silence. Instead, you need to use the gain factor, which is a value from 0 to 1 (1 is unity gain, and 0.5 is -6dB). The example I posted above uses this scale (there are functions in HISE to convert from decibel values to gain factor and vice versa).

But even with the gain factor, a crossfade without volume changes is only possible for coherent signals, which are practically non-existent - even the same recording with other mic positions has different phases. For all other signal types, you'll need to apply an equal power crossfade - that is why I added the table so you can adjust the curve to the shapes known from your DAW crossfades :)

Take a look again at the example code, it's all in there. Obviously you need a slider with a range from 0 to 1 instead of -100 to 0 (the mode NormalisedPercentage will do that for you).

local gainValue2 = CrossfadeTable.getTableValue((1.0 - value) * 127);
local gainValue1 = CrossfadeTable.getTableValue(value * 127.0);
	
local dbValue2 = Engine.getDecibelsForGainFactor(gainValue2);
local dbValue1 = Engine.getDecibelsForGainFactor(gainValue1);
	
CloseMicGain.setAttribute(CloseMicGain.Gain, dbValue1);
FarMicGain.setAttribute(FarMicGain.Gain, dbValue2);

[nick]

Thank you for your help. I'm currently busy with a commercial project, but will return to the project soon.