When I look at the sine wave it is complete and centered.
The camera shows part of the sine wave.

You have the Trigger Mode set to "Auto". You may get a more stable display by switching it to Normal and adjusting the Trigger Level. The scope should work very well for what you intended.

 

You have the Trigger Mode set to "Auto". You may get a more stable display by switching it to Normal and adjusting the Trigger Level. The scope should work very well for what you intended.

That helped a little. No worries I can use it as is. It's not bad just noticeable.

I was able to accomplish my goal, so I am content. I found with my system to sound better then before even though it never had a clipped signal. I started over from scratch and the system sounds amazing.