user2122: I had accidentally created numerous wrong keyframes, trying to tune volume. Now I would like to delete them. Unfortunately, I can't select multiple keyframes by mouse:

When I release mouse, all keyrames remain not selected.

user11523: You can do it in the Effects Control window:

Even if keyframes were added on the timeline, it will work.
Good luck!

2122: <p>I had accidentally created numerous wrong keyframes, trying to tune volume. Now I would like to delete them. Unfortunately, I can't select multiple keyframes by mouse:</p>

<p><a href="https://i.stack.imgur.com/47EfJ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/47EfJ.jpg" alt="enter image description here"></a></p>

<p>When I release mouse, all keyrames remain not selected.</p>
 11523: <p>You can do it in the Effects Control window:
<a href="https://i.stack.imgur.com/GuEka.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GuEka.png" alt="enter image description here"></a>
Even if keyframes were added on the timeline, it will work.</p>

<p>Good luck!</p>
