No I didn't know that, I'm going to have to research this so that I understand it properly.What the dB refer to is the amount of attenuation being applied to the signal.
An attenuator is another name for a volume control (you probably already know this)
The levels go from infinity attenuation up to zero attenuation.
Thank you anyway that's helpful.
Time to go and do some reading up on attenuation etc.😀