Carburettor Terminology

Hi all In the workshop manual under the technical specs section for Carbs there are two references to "Mute" ????
The first is for main jet 230; 220 with Mute
The second is for needle position top with Mute

Now mute to me says some sort of baffle of restriction, which with the main jet i could see (even if i don't quite get). But what this refers to with the needle position i haven't a clue

Any ideas what put my mind at test

olympus said:

Now mute to me says some sort of baffle of restriction,

Click to expand...

The mute is item 34.
https://andover-norton.co.uk/en/shop-drawing/46/exhausts-mufflers-mute-passenger-footpegs

Silencer mute, got it. Thanks Les

Ah, i see, its the carb jet/needle recommendations if you are running silencers with mutes.