Re: Deep Blue Delay with Expression Pedal Jack

Posted by nocentelli on Oct 25, 2015; 7:22pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Deep-Blue-Delay-with-Expression-Pedal-Jack-tp25479p25482.html

I think it might work without any modification (e.g. parallel resistors to lower the effective value of the pot from 250k 50k). The mix pot is just a voltage divider, with the wiper sending a fraction of the delayed signal to the mixer opamp: in these circumstances, the value of the pot used for the divider is rarely critical to the successful operation of the circuit. You just need to wire a switching stereo jack to the mix pot lugs, so when the expression jack is inserted, it disconnects the on-board mix pot and connects the expression pot in it's place; if you want the same value you could connect a 68k resistor across the outer lugs on the switched jack.