Would this work as a voltage controlled attenuator?

[tonetta]

So I tried to design a delay where I can choose which part of what I'm playing is sampled. The J107 is supposed to have an on-state resistance of about 8 ohms, would this be enough to turn off the delay? Alternatively I guess I could use an expression pedal to control the input of the delayed signal.

How it should work is by holding the push button you create a square pulse that is modulated by the low pass filter into a smooth control signal which turn off the jfet.
While we're at it, I would appreciate it if anyone could quickly check my schematic to be sure I didn't do any mistake. Thanks.

[PRR]

> on-state resistance of about 8 ohms, would this be enough to turn off the delay?

Do math. You seem to have 5K feeding the JFET. When the JFET goes from infinity to 8 Ohms, signal drops to 8/5008 of normal. This like 1/625 or -56dB. Not "perfectly off", but "very-very-very-weak". If there is no other sound, you will eventually hear this leakage. If anything else is happening, you won't.

[garcho]

CMOS and a momentary foot switch, like "punching in" on a board