Reverb knob maths

Dear forum,
I have an instrument with a custom reverb slider in the GUI that affects the reverb plugin's send level on the send FX. So far so good, also the bypass-function (button) for the reverb is working.

Because the reverb's send level makes the whole instrument louder, I would like to achieve that the reverb slider's value, which increases the reverb send level, simultaneously decreases all groups' volume level at a rate that corresponds to the increase in the reverb's send level.

I absolutely miss the maths necessary to do this operation.

didn't work.....

Right now my code looks like this – what do I need to insert?

Code:

on ui_control($revknob)
    $adsr_count := 0
    if($revknob_switch = 1)
        set_engine_par($ENGINE_PAR_SEND_EFFECT_OUTPUT_GAIN, $revknob, -1, 0, 0)
        while($adsr_count<$NUM_GROUPS)
            set_engine_par($ENGINE_PAR_VOLUME, ???, $adsr_count, $revknob_idx, -1)
        end while
    end if
end on

 

The default group volume (0 db) is around 630000. You could use:

Code:

set_engine_par($ENGINE_PAR_VOLUME, 630000-$revknob, $adsr_count, $revknob_idx, -1)

and try if the amount of the volume reduction fits. Otherwise scale the reduction by e.g. double the $revknob value...

 

Thank you so much!
Solutions are often enough easier than one thinks...
Only problem is because I have around 250 groups the volume adjustment is laggy. I think I will have to go with the Master fader...
But this has really helped me!

 

There is a new weird problem – maybe a bug. I have a Plate Reverb as a send plugin and would like to set the stereo width to 0% by default (so reset it every time the instrument is loaded, no persistence).
In the init callback I have:

Code:

set_engine_par($ENGINE_PAR_PR_STEREO, 0, -1, 0, 0)

Then on ui_control:

Code:

on ui_control($revknob_button) {this button turns the reverb on}
    if ($revknob_button = 1)
        {......}
        if($rev_stereo = 0) {this button puts the Stereo Width to 100% or 0% respectively}
            set_engine_par($ENGINE_PAR_PR_STEREO, 0, -1, 0, 0)
        else
            set_engine_par($ENGINE_PAR_PR_STEREO, 1000000, -1, 0, 0)
        end if
    end if
{.......}
end on

on ui_control($rev_stereo)
    if($rev_stereo = 0)
        set_engine_par($ENGINE_PAR_PR_STEREO, 0, -1, 0, 0)
    else
        set_engine_par($ENGINE_PAR_PR_STEREO, 1000000, -1, 0, 0)
    end if
end on

The problem: every time I load the instrument, both the $rev_stereo button and the actual engine value (the Stereo knob in Plate Reverb) are set to 0, but when I turn the reverb on the sound is stereo (both values in question are still set to 0 at this point). Is this a bug?

All other engine parameters are set to the scripted value, only Stereo isn't.

 

Why do you have two controls that do the same thing?

 

The "revknob_button" is supposed to turn the reverb on; the control "rev_stereo" is hidden when the reverb is turned off. Upon turning the reverb on, "rev_stereo" appears so if you'd like to have a stereo reverb rather than the default mono reverb, you press "rev_stereo".
In the above script, I wrote the command to set the stereo width twice because I wanted to make 200% sure that the reverb was switched off. (I know 200 "per-cent" makes no sense. )

The problem however is not the script; the problem is that despite stereo width is set to 0 in the actual send plugin inside the engine, what comes out of the speakers is still stereo. I think the script is not at fault here.

 

OK it seems you have stumbled upon a bug in the plate reverb effect here. Seems it doesn't initialize properly when Stereo is dropped down all the way.

 

I was hoping it wouldn't be true...
Is there a way to report bugs to NI? I can't seem to find a thread for this purpose.

 

I've already reported it.