Shortening the decay of NS-2

[Max9999]

Hi people,

I would like to shorten the decay time of the NS-2 a bit. Looking at the schematic below I am interested in the general workings of the decay circuit.
Is it basically a variable time constant of C19 with VR2+R29+R30?

Thanks!

[Mark Hammer]

My guess is that the minimum decay time depends on the value of R29.  I can't imagine Boss would provide a minimum decay that was jarring or disruptive.  But, since you can test the hypothesis in a non-invasive and reversible way, locate the pads where R29 is soldered to and tack on a 3k9 to 10k resistor in parallel, without removing the stock 4k7.  The combined parallel value will be 2k1 with an added 3k9 resistor, and 3k2 with 10k.

[Max9999]

Hi Mark,

I took the liberty to short R29. At minus setting of VR2 the decay did decrease a bit. Only at higher VR2 settings it caused a sputtering sound.

It seems that R29 has another function then setting the minimum decay.

Looks like I need to decrease C19.
Anybody knows how to calculate the value to put the current minimal setting in the middle of the decay knob?

My question about if the decay is a variable time constant between C19+VR2+R29+R30 is still something I would like to know