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HeyBub[_2_]

wrote:
What is the process to insulate a interior wall with blow in
cellulose? I'd like to insulate an interior wall to deaden the noise
coming through it. I'm not sure if it's worth renting a machine just
to do a wall. Is there another way?

Don't think that will do much good.

The sound vibrates the outside wall. The outside wall vibrates the studs.
The studs vibrate the inside wall.

If you had an outside wall, no studs, and an inside wall, there wouldn't be
much sound trasmission at all.

Which brings to mind the fix: A free-standing additional wall, not connected
to the existing one.