Help with Manual sweep in OTA phaser

[Epameinondask]

Hello everybody.

So, I'm trying to make a phaser with a manual mode. Just like the manual mode of the Bad Stone. I tried doing this by using a 10k pot as a voltage divider and with some extra resistors, I got very close to the sound that the phaser has is auto mode. But it's not identical and the reason I'm trying to make it identical is because there are some sweet spots in the frequencies that are being swept when in auto mode that when I'm in manual mode I just can make it to sound like the LFO does.

I've been doing some thinking and came up with an idea. Since this phaser is a small stone style and the LFO is OTA based, a voltage divider is not suitable for the manual mode the same way an op amp LFO isn't. So the question is, would a current regulator like the LM317 do the job? Or a current source in general? My goal is to use this function with an expression pedal too.

Thanks a lot in advance!

[Epameinondask]

I've been doing some thinking and came up with an idea. Since this phaser is a small stone style and the LFO is OTA based, a voltage divider is not suitable for the manual mode the same way an op amp LFO isn't. So the question is, would a current regulator like the LM317 do the job? Or a current source in general? My goal is to use this function with an expression pedal too

Bump 

[samhay]

You may be able to hack a pot into the LFO biasing circuit to do what you want.
How similar to a Small Stone is it? Can you post a schematic?