precise control of tempo-sync feedback duration of delay units ? (RT60 or alike)

[Krakatau]

i have a question/request about feedback loops, are they such effets with a more precise tempo-synced feedback duration control, as it is similarly the case with many modern reverbs units ?
(exponential audio or also chromaverb in logic)

does it make sense ?

[Krakatau]

anyone ? ...is it so irrelevant ?

[whyterabbyt]

Not sure I fully understand, but I'll give it a go. Do you mean feedback within a delay effect? If so, you could probably tempo-sync modulation of the feedback parameter above/below the threshold for 'feedback-y' feedback in some more flexible stuff, or via your DAW.

Or maybe do the same for mix or whatever on a dedicated feedback plugin (eg ST Acoustic Fedback)

[Krakatau]

thanks for paying attention...

well...I'd see this as a feature that would adapt the duration of the feedback of a delay unit in a similar way some reverbs plugins adjust their RT60 duration

so, for instance, if you have "release time" (RT60?) of the feedback on a delay, that last 2 measure, it would adapt itself automatically if you change the delay time of your delay unit without changing the song's tempo

Not as spectacular as on a reverb, but another useful parameter to control a potentially significant aspect of your mix ?

[whyterabbyt]

Again, Im not 100% sure what you mean, so feel free to correct me if Im wrong.

But to me, the duration of the feedback of a delay is a multiple of the duration of the delay, so tempo sync'd exactly as the delay time is.
The number of times a given 'portion' of a signal passes recirculates the delay is going to be dependent on the feedback amount, ie the mix of delayed signal back into the input of the delay. That's usually percentage based, rather than an actual volume measurement, so Im not sure if there's a formula to derive how long a signal 'lasts' but it shouldnt lose gain 'within' the delay so I would expect that any sync to tempo is already maintained.

[Krakatau]

well supposing you have a delay time with a number of audible feedback, in the case of a twice shorter delay time, the number of repetition would be automatically twice more to reach the same duration (without changing host tempo, of course !)

that's the idea ?

[whyterabbyt]

well supposing you have a delay time with a number of audible feedback, in the case of a twice shorter delay time, the number of repetition would be automatically twice more to reach the same duration (without changing host tempo, of course !)

that's the idea ?

ah, now I think i see.

in that case, the issue would be that 'something' would have to detect the level of the signal being fed back, because the parameter control isnt sufficient, basically being a gain control over the signal being fed back. once you have a level and the gain setting, you can determine how long it would take to be inaudible.
problem is, that the volume of the signal is variable, and within the delay line also contains a mix of multiple iterations through the delay.
i guess you'd need to measure the volume of the dry signal entering the delay, average it over the length of the delay, and delay 'use' of that measurement in your calculation by the length of the delay.