I don't have OCD as far as I know but I do have intrusive thoughts and actions I have a very strong compulsion to do in response to certain things, to the point I feel mad if I don't act on them. Ie. I have an intrusive thought, obsess, convince myself if I just do this one thing it will get better, do the one thing and temporarily feel almost high, realise I dun goofed and freak out so the cycle can begin again.
My intrusive thoughts are usually either violent or scary though, not sounds. I found talking through them with my therapist really helped but if you are also going through CBT that part of my comment becomes useless. I got taught in therapy to practise stepping outside of myself to observe my thoughts and when I am detached, to imagine it passing as if I'm on a train and it is just a cloud. It helps when my anxiety is at a low level but not at a high one so far I'm afraid. Oh yeah and in case it isn't clear, my compulsions are not violent. I don't know if that's any help sorry.