preamps without volume knob?

Hi, looking into tube preamps,(arc) and notice some don't have a volume knob. There is a gain adjustment, an attenuation adjustment, but no volume adjustment. I've
searched the archives. Do you use the gain and attenuation
to adjust the volume? Please help this newbe out. thanks.
Gain is the volume control.
Well that was easy, thanks Weiserb.
IIRC, it is actually attenuation that controls volume, while gain adjusts the maximum gain available.