Thank you Vadim for the update!
I'd like to ask another quick question on the phaser detailed in Chapter 6. I have a working implementation of the phaser shown in figure 6.4 following from my earlier posts in this thread, and it sounds quite nice. I am noticing, though, that at high feedback values, the filter gain can be pretty intense (both near DC and at the resonant peaks).
Following from section 4.3 about the feedback path in a ladder filter, I expect that I should be able to attenuate the input signal by some factor such that at high feedback values, DC and the resonant peaks stay near a gain of 0dB, but I can't figure that value out. I tried working out the analog transfor function and evaluating it at s = 0, following from the same steps used in section 4.1. I've sort of arbitrarily tried multiplying the input signal by (1 / (1 + k)) as well as (1 - k * A) where A is (2g - 1)^4 from resolving the feedback loop for a series of allpasses, and neither seem appropriate.
For example, here's a quick analysis tapping my filter after the last allpass (cutoff at 440Hz, k = 0.44), before mixing with the dry signal:
Ideally I'd like to find the gain factor that translates that magnitude response down to where the peaks are at 0dB. But I'm not sure where to go from here. How can I derive the appropriate attenuation factor here? Or am I on the wrong approach in general?