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Re: [fluid-dev] [jOrgan-user] [FS reverb level sounds]

From: Graham Goode
Subject: Re: [fluid-dev] [jOrgan-user] [FS reverb level sounds]
Date: Tue, 12 Apr 2011 13:18:21 +0200

Hi David,

Now that is it in a formulated nut shell! That does make better sense
of various variables.


On 4/12/11, David Henningsson <address@hidden> wrote:
> On 2011-04-12 12:44, Graham Goode wrote:
>> Hi David,
>> ["base reverb level" in soundfont + CC91] level does not make
>> mathematical sense to me.
>> Base reverb level is given in % value, CC91 is 0-127. What is the
>> conversion?
> First, in the soundfont we have a reverb level at the instrument level,
> which ranges between 0 and 1, call this "I".
> Second, in the soundfont we have a reverb level at the preset level,
> which ranges between -1 and 1, call this "P".
> Third, if not overridden by the soundfont, there is a reverb modulator
> that tells that CC91 should affect the reverb level, which ranges
> between 0 and 0.2, call this "M". IIRC, it's linear, so M = CC91/127 * 0.2.
> Fourth, the global FS reverb level, which we call "F".
> Take the sum of I, P and M. Clamp it to be between 0 and 1 (i e, if
> greater than 1, it's 1, if less than 0, it's 0). Multiply with F.
> Reverb level = F * clamp(I + P + M)
> Hope that explains what you need to know as I might not have time to
> give more explanations today.
> // David

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