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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