Are there volume controls for multiple channels?

Question

Electronics

Good day to all.
Tell me, please, do they exist in nature, and are there volume controls for several channels on sale?
I assembled a multimedia system in the apartment, and in one place I need to adjust the volume for various outputs coming from the computer.
(you need about 5 channels at the input 3.5 jack, and the same output)
While hiccuping, I didn’t even find volume controls for sale separately
from the speakers, even for 1 speaker .. There is an idea, to assemble the volume control on my own, and am I right in thinking that can it be done using 5 variable resistors?
such as:

Answer 1

That's right, resistors can be assembled. It is only necessary to choose resistances so as not to spoil the signal-to-noise ratio.

Answer 2

several DS1869 or DS1802
yandex

Answer 3

Click here , and you'll see, Google will help with the calculations, the assembly is simple, look for regulators in the grandfather's box =)
And here the level is higher, with calculations right away.