At the moment I am trying to create an audio circuit, in which I need to reduce an audio signal from 2 V into a variable output of 0,030 V to 0,350 V. For that I think a Logarithmic Pot will do the trick, but I don't know how to get it to 0,350 V first.
But here another thing. I plan to enclosed the circuit in a box and I don't want to have potentiometer inside of it which I can precisely control, i.e. let's say the box has a hole so you can reach the potentiometer inside a rotate accordingly with a screwdriver, there's no real way to say: "ok I move it a quarter to the right or to the left. Therefore I would like to have a switch, digital, a hex switch I don't know I have no idea, that I can externally select let's say letter B and that means that the voltage will be decrease 20 dB, or when I select letter G the voltage will decrease 40 dB.
I hope I have explained myself, I'm a little new to this so sorry if I am mistaken or misunderstood something.
Thanks in advance for your help.