Much ado about nothing. Even bow noise is fussed over too much. Do you think there is any bow that ANY game animal cannot hear when it shoots? I think not. I have my preferences, but truly believe I could be a good hunter with any bow that has A. reasonable draw weight B. decent arrow flight. Everything else is just taste.
I need to start taking a video camera with me when I hunt and show folks what I am talking about. Last September for example- I was hunting whitetails in a tree that was over a well-worn train between a canyon bedding area and an apple orchard. About 20 minutes before dark a coyote came along the trail. He saw me draw and scooted out of there before I could shoot. I sat down and started to try to slow my heart rate when along came a decent 2 yr old buck. I drew while still sitting and loosed an arrow from about 20 yards away. The impact sounded great, but to my surprise the buck jumped and took a few steps forward and just stood there. I could not see an arrow wound, so I nocked another and watched it disappear through his 12-ring. He ran down the hill and piled up.
When I recovered him I saw that my first shot had entered the skin behind his front elbow and cut a non-fatal gash on his brisket.
Why do I tell this story? To illustrate that if a deer does not know you are there they will not act like a teenage boy going to his first dance. This deer I'm talking about heard my bow twice, hack he felt it too and didn't run off because he didn't know what the heck was going on.
The winning combination is getting close and staying undetected. Do this and you can kill 'em with anything.