Mom with Alzheimer's constantly makes noises. Is this part of the disease?

Obsessive behavior of different types isn't unusual at all with dementia. Making noises may be a way for her to reassure herself in some way.

Music can be so effective for people with Alzheimer's that there are people who specialize in music therapy. I'd suggest that you make music as much a part of her environment as possible. Experiment with different types (naturally, the music playing at church should be included).

Observe her response to different types of music and adjust accordingly. You're on to something, so go with it. Often that's what we have to do - experiment. When something works keep it up. When it doesn't, try something else.
Good luck,
Carol

Yes, my mother growls and groans and obsessively picks at anything in front of her. clothing food drops dog hairs, she will spend most of the day picking at blankets bib n tray clothing....and the growling/groaning I attribute to using her vocal chords in some manor, as a comfort so to speak as mentioned above, as she speaks very little...idk!

It could be a type of seizure activity or a medication side effect. If music prevents it, play soothing music more often.