Question: how limit touch region for webaudio-knob

[schoko11]

Hi, this is rather a question than an issue.

My demo site
https://schoko11.github.io/KEKO-WEB/

structure:
<section>
<div>
<webaudio-knob>
</webaudio-knob>
</div>
</section>

How can i limit the paning of the knobs to just the class "webaudio-knob-body", and to force scrolling of the page when not touching the "picture" of the knob.

Sorry for this noob question...

Thanks, klaus