Bose T1® Backing Tracks 

Here's a quick video to help you to set the input trim for the T1® for backing tracks or pre-recorded music. This is called Gain Staging.
This includes a look at using the Input Level meter.
The same principles apply for an instrument or line level input. Set the source to the highest level that you will need during the show, and then set the input trim so that you get solid green, occasional yellow flickers, and never see red.
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