The title says it all. Here is a link to Steve Neff playing the same tunes on metal and hard rubber Theo Wayne Ghia 3 mouthpieces.
Can You Hear a Difference Poll? Theo Wanne Gaia 3 Tenor Saxophone Mouthpiece Comparison
Does the mouthpiece material make a difference? Theo Wanne Gaia 3 Tenor Saxophone Mouthpiece Comparison
www.neffmusic.com