On Mon, May 13, 2013 at 5:55 PM, John Serafino <[email protected]> wrote:
> Looks good if I understand it. I'm a little unclear on a couple of things
> though:
>
> 1. Order of operations is not 100% clear. Are we doing
> parenthesis->multiplication(and division)->addition, or something else? I
> usually just use a million parenthesis. ;)
>
Yeah, standard order of operations: parenthesis, exponentiation,
multiplication, division, addition, subtraction. It may seem odd that the
resonance and cutoff knob values are not multiplied by the 2.0 or 6000.0
scale factor, but that is because the knob value is already in the
appropriate unit (Q or Hz). Perhaps that scale factor can be removed if we
push the units to the GUI. But, I honestly think that might just confuse
the user more since the ultimate cutoff would be a function of the knob,
the envelope, and the lfo.
> 2. X squared keeping the original sign is not (|x| + x). I'm just
> assuming that (x^2) means x squared keeping original sign, and not... that
> other thing.
>
Ooops, Typeo: it should be |x| * x, where |x| is the absolute value of x.
Or, in other words:
-x * x, if x < 0
x * x, otherwise
Thanks for the feedback! Also, I apologize to everyone else if this thread
is off topic. I was hoping it may help shed some light on the internal
working of the current LMMS filters as well.
-- Paul
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