Aria player mixer settings lost when I start playback

Per the live video about VST instruments, he said, unless you set it up to send individual channels to different channels in the Dorico mixer, all the instruments in one Aria player’s bank go to one channel in the Dorico Mixer. And, he said you should adjust the volume in the Aria Player mixer for the instruments on that bank. So, that works, until I click playback, then the adjustments are lost.

Any one have a solution? Thanks!