Questions about the Comb module explanation in the manual

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In Split Comb explanation:

"Any input is summed to mono and fed to the first of two delays, which then cross-feed each other. In this mode, Tone is the ratio between the delay times and Flavour controls the amount of input signal fed (directly) into the second delay."
What does cross-feed mean as opposed to just feeding back into it? I'm having some trouble visualizing what kind of routing this produces.

What does he mean by ratio? If the first delay is 0.1ms for example, does it mean the second delay is x times that amount? So basically it just controls the time span between the delays? How does this impact the sound? Does this impact the sound by changing which frequencies are filtered?

If the flavor controls the amount of input fed into the second delay, when it's at zero is there no input signal fed into the second day? What happens when you turn the flavor into negative? And how does this input impact the sound? Does it also just make changes to which frequencies get filtered?
In Diff Comb explanation:

"The same as Split Dual except that the second delay is an allpass filter."
How does the fact that the second delay is an allpass filter influence the sound? Does it also just give different filtering in the frequencies?
In Dissonant explanation:

"A 4x4 feedback delay network, this mode always sounds metallic. The Tone and Flavour parameters both affect delay time ratios (i.e. the pitches)"
What's a 4x4 feedback delay network?

Why does it say "(i.e. the pitches)"? Is the delay time related to the pitch?

Sorry for all the questions, I just love the Comb module and I use it all the time and it would be great to have some logical understanding of how it works. My knowledge of audio is limited, I know that delays shorter than 1ms cause comb filtering, and that a modulating delay time causes detuning and phase cancelation which gives the chorus effect, but that's about it.

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Not very knowledgeable regarding comb filters and reverb in general, but this KVR thread has some good links to technical information:

http://www.kvraudio.com/forum/viewtopic.php?p=1675772

I think the 4x4 network refers to the number of comb/all pass filters, and cross feed probably refers to the configuration (series or parallel). The all pass filters provide diffusion I believe, or at least attenuation.

I'm probably butchering the facts so I'll stop there. Hope the link helps! :shrug:

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