It's hard to say without seeing exactly what you are doing, but generally I do this by dropping my shoulder and projecting the ball out into the lane. Having a good knee bend also helps get lower to the ground for a smoother sounding release.
All that said, I wouldn't worry about it all that much. Yea, making almost no sound when you release is pretty cool, but it in no way means you will have better scores or anything. If you are comfortable playing the way you are now, you might as well stay that way.
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