I'm trying to find a solution for the following problem: I have a RETURN section of a circuit that has to mix a DRY and a WET audio signals. The circuit is Stereo.
The tricky part is that i want the DRY signal to remain unaltered and not-attenuated until half rotation of the knob, and then it decreases.
Example: I leave the RETURN Pot at 12 O'clock. I can play with the SEND and add it to the DRY. Now i turn the RETURN counterclockwise and. IF the RETURN pot's curve is normal, the DRY signal will have a change in volume (a little bit louder). IF the RETURN pot's curve is like the one I'm looking for, then i won't hear any change in volume on the DRY.
This idea Is different from a simple summing amplifier solution since when the pot is at clockwise position, only the WET will be heard, at counterclockwise position only the DRY will be heard and at 12 o'clock both can be heard BUT the DRY remains 1:1.
If a Quad-gang MN Taper (blend/balance) would exist, this would be straightforward and would avoid lots of headache but this doesn't exist.
I could buy a linear Quad-gang potentiometer and mess with the carbon resistive trace (i.e. adding special conductive paints to short half of the track) but I don't think is an ideal solution, since It would be probably last a short time and is also quite time consuming.
Do you have any hints or do you think is possible to achieve somehow?