[sdiy] Digital 4 Pole Multimode Filter

[Scott Gravenhorst]

Thank you to all who replied.

Very helpful information.

Someone asked why I wanted a 4 pole SVF.  In fact, I merely wanted a multimode 4 pole
filter, and I'd read that SVF can have 2 or more poles.  So a sort of "why not?" thing.  

The comments about cascading 2 pole SVFs made a lot of sense.  The modes are easily
available.  I'm assuming that if I want 4 poles of highpass, I would take the HP out of
the first SVF and put that on the input of the second SVF also set to highpass and make
the Fc the same for both to get the -24 dB/oct falloff.  Same with BP et al.  And the
idea of cascaded two SVFs with unlike Fc is also appealing.  It seems a very versatile
system which is exactly what I want.

Now tackling Q enhancement, but that's pretty trivial.

-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- http://scott.joviansynth.com/
-- When the going gets tough, the tough use the command line.
-- Matt 21:22