Splitting audio and video on ipad

I did find away of splitting the video and audio when you want to use a second screen for your videos it’s not ideal but it works for me I’m using an iPad Pro 5th edition what I did was connected the tv to the iPad with usbc multi adaptor hdmi then I got a Bluetooth receiver plugged that into my mixer we’re I would normally plug my audio leads in and then connected that to the iPad with Bluetooth now I have videos on the big screen and audio out threw my mixer