That's not true at all. How do you think analog steep-slope filters are created? You pass a signal through the filter multiple times. This is where the number of "poles" in a filter comes from: how many times the signal is fed back through the filter. First time through the signal is decreased 6db per octave, the second time another 6 so it becomes a 12db/octave filter, then 18, then 24, etc.pottering wrote:once you filter a sound. let's say low-pass, there is nothing left to low-pass at the same freq again. Even if it was per-repeat it would make no difference in the sound.
Try it yourself, load up duplicates of any filter plugin with a gentle slope and put them in series. Compare the signal after each plugin.
In a delay, if you place a filter in the feedback path, each repeated signal gets filtered more and more. It's great for the spacey "dub" type effects.
