As a play in a small band I'm sometimes required to put in either a bass bone part or sometimes even a tuba part. Now I currently play a Rath R4F with a Bach 5GS. Will a smaller bass mouthpiece work for a slightly fuller lower register? I'm not thinking a huge size, maybe something like a Wick 2AL or a Bach 2G or possibly a 1 1/2G. Sadly I don't have access to a bass bone or tuba so I'm trying to work out how best to fudge it. All opinions greatly appreciated!