"bottom" control of the Pentavocal;

[Bernardduur]

OK. I am looking to build a new tremolo and I found this option on the "Pentavocal trem" (Red Witch) that is called bottom;
The Bottom control allows the user to dial in the amount of mid
range and hi frequency cut that occurs as the volume decreases in
the trem cycle.

How is this done? Could it be added into an EA tremolo?

[calpolyengineer]

Do you have a schematic for it? Or a link.

-Joe

[Bernardduur]

No, I was just wondering how it could be done... Could be a nifty addition to a tremolo pedal

Here's the information page

[nelson]

The lfo could be connected via an optocoupler and a pot in parallel. This would control a simple tone control.

[Bernardduur]

Yes, I get it.....