Question on potentiometer PCB with 2 inputs?

[rabbitz]

I have a potentiometer PCB that has 2 inputs... R1GL1 and R2GL2.

Input 1 (R1L1) is standard but looks like input 2 (R2L2) goes to a resistor at R1L1 by the top PCB marking. The question I have is what is the purpose of this resistor in series with the input? From the listing it's referred to "when using the decay resistor".

 

[DF96]

Input 2 allows you to insert a series resistor for extra attenuation.

 

[rabbitz]

Thanks. I can think of a couple of more uses for that arrangement.

 

[MAAC0]

I've seen resistors in some combo amps for the Bass section where when You turn the pot down, it doesn't cut the bass completely.

 

[rabbitz]

Yes, I've seen some that do a loudness circuit and I think this one below could be one.