MN3008 BBD circuit - modifications help

[ilcaccillo]

Thank you so much for the explanation and the article anotherjim.
It will be a good read.

I will use this for mixing and most of the time with faster delays in slap back territory, if I for some reason want the slower stuff I can also EQ a bit the FZ return on the DAW.
THe whine gets worse when the pot measure around 70K, I will use the 100K pot wich provides a good range with a whine in the last 25% rotation of the Pot, It's fine.
Thanks

One thing I'm having difficulties in understand is the difference between "Reverb" and "Echo" of this machine since both sound really similar.

[anotherjim]

Echo is a delayed repeat and would ideally the repeat would be clearly heard to be a copy of the original. Reverb is complex with repeat upon repeat constantly being added to by new repeats that contain older repeats. Feedback is what makes it complex - in the simplest case there is only a single time delay but this is not real-life. Ideally, repeats have different time delays. There are BBD chips with multiple output taps from the delay line to give different delay times. Those are intended to do reverb properly.
If I could be bothered to make my own reverb processor but wanted the BBD sound without the problems, I think I would be tempted to use clean digital for the long and variable delays and put a BBD in with a fixed shorter delay for the colouration.

[ilcaccillo]

Echo is a delayed repeat and would ideally the repeat would be clearly heard to be a copy of the original. Reverb is complex with repeat upon repeat constantly being added to by new repeats that contain older repeats. Feedback is what makes it complex - in the simplest case there is only a single time delay but this is not real-life. Ideally, repeats have different time delays. There are BBD chips with multiple output taps from the delay line to give different delay times. Those are intended to do reverb properly.
If I could be bothered to make my own reverb processor but wanted the BBD sound without the problems, I think I would be tempted to use clean digital for the long and variable delays and put a BBD in with a fixed shorter delay for the colouration.

Hi anotherjim,
I'm a professional mixing Engineer,  I'm quite familiar with Reverbs and Delays and the diference between the 2.

"One thing I'm having difficulties in understand is the difference between "Reverb" and "Echo" of this machine since both sound really similar."

Maybe I didn't explain it well, what I wanted to say is that the in 3 Modes in this machine (Reverb, Echo, Duet), the 2 first ones Reverb and Echo sound pretty similar, it was the way the manufacturer decided to set them.
This unit is based on DDB delay chip, so a Reverb mode will always be a fake/pseudo reverb.
Between "Reverb" and "Echo" modes the feedback, Delay time sound pretty similar

Thank you so much