Tweaking the Canon 80D audio

Hello,
I record concert band concerts with the 80D with a Tascam recorder attached on a hotshoe. I want to ensure the Tascam records better audio than the 80D, but the 80D does have pretty good audio. Therefore, I am interested in tweaking the audio settings on the 80D to ensure the audio from the recorder is more of the “reference quality” and is far better than the 80D’s audio. If anyone has any setting or tweaking tips that would be appreciated. Thanks!
And just to clarify: I currently have audio settings set to auto and attenuator on. I plan to turn the latter off and turn on the wind filter, but any other setting suggestions are appreciated.
Dan