I shoved the Timbre app in front of Adam and got him to play a note with each of his mutes to see what they looked like.
Here is an unmuted C. The indicated note is concert pitch. I forgot to change it. The harmonic at the 5th is quite strong.
Next was a straight mute made of metal. Slightly harsher tone, fits with the increase in the number of harmonics.
Next was the Harmon mute. This is a kind of tinny sound. More harmonics here.
Next was the Harmon mute without the stem, or as Adam prefers, "The Thingy". This is a hugely different Timbre. There are lots and lots of harmonics here.
Trumpet mutes make the higher harmonics more prominent in different ways to make the distinctive sound of each mute. The cup mute is a bit on an exception, having the reverse effect.
In order of dissonance we have:
- Harmon - no stem (most dissonant)
- Harmon - with stem
- Straight Mute
- No Mute
- Cup Mute (most mellow)
All have their place, and I've learnt a lot about mutes in the process of trying this.