I'm a hobbyist so my theoretical knowledge surrounding electronics is pretty limited.
I'm working on modifying a synthesizer that uses a sine wave control signal whose frequency is in the sub-audio range. The signal peaks at -5v & 5v, and is used to control things like pitch and amplitude of a signal.
I would like to add a potentiometer or some other control to the circuit so that this signal can be attenuated by the person playing the instrument. I would like it so that the potentiometer could allow the signal's amplitude to be changed over time, depending on how the user turns the knob/moves the slider.
To further clarify I've attached an image.
the blue line represents 0v, and the red line is to illustrate the scaling function as it works over time.
My uncertainty is about whether or not a simple circuit can achieve this, and if it is as simple as using ohm's law how I apply it in this situation to pick the proper resistance of a potentiometer.