H9 Spring Reverb algorithm with MIDI – Mix confusing

[gateley]

Hello,

The H9 Spring Reverb algorithm has a “mix” parameter, that controls the mix between the reverb signal (wet) and the tremolo signal (dry).

The mapping from MIDI CC number to mix ratio is not intuitive – it seems to be a quadratic function, but not an obvious one:

Number 0 maps to Mix 0

Number 127 maps to Mix 100

Number 64 maps to Mix 34 (I would expect 50, if it were linear, or 25 if it were a straightforward quadratic)

And the other values are similar: it grows very slowly for small CC numbers, and very fast for large CC numbers

 

What is the rationale for this?

 

Thanks

 

John

[brock]

Eventide can answer better than I.  The reasoning often given is that the curve is ‘skewed’ to allow finer access to the more important or useful values.  I can see that, in many cases.  There are also wider ‘dead spots’ around some normally centered parameters, like pitch/delay mixes and such.

When it becomes more problematic for me is where a pitch value won’t re-center perfectly.  Or an envelope parameter hits -1 to +1, but not 0 with any MIDI CC value.

I also understand that some parameters might only have 3 values, and others a few hundred.  So compromises have to be made in compressing / expanding to 128 discrete values.

[Author]

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