[sdiy] Pole Mixing

Brian Willoughby brianw at audiobanshee.com
Sun Apr 11 07:04:33 CEST 2021

I definitely support a dedicated Xpander / Matrix-12 page, in addition to the main page with all the options.


On Apr 9, 2021, at 09:50, David Moylan wrote:
> Working out the algebra to handle the feedback signal made me realize something about the Xpander implementation.  Rather than including a mix of the true dry input signal needed for certain modes, the Xpander switches the first integrator essentially into a buffer.   This makes the mix from the first integrator section a "dry" signal and the rest of the transfer function is then 3 pole based.   That means the feedback signal in that structure, for those modes, is also a 3 pole low pass signal instead of the 4 pole low pass when the integrator is engaged.
> Makes me curious about how that will effect the transfer functions with feedback applied.   Will maybe have to set up a new page dedicated to the exact Xpander structure after I get this feedback signal worked out for the original app. Down a rabbit hole...

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