Audio Upgraded Unity Project from 2019.1 to 2019.3 - now no Mixer plugins except Send,Recieve, DuckVolume

hey folks title pretty much says it all. i upgraded a project from Unity 2019.1 to Unity 2019.3 and the Mixer plugin no longer lists any effects except Send, Receive, and Duck Volume. i had created other plugs on one channel but while the effects are visible they cannot be accessed or edited.

tried creating a new Mixer and it was the same situation - just those three plugs. then i created a new project in 2019.3 and added a Mixer and all the plugins show up in that situation.

any idea how to solve this issue other than transferring everything to a blank 2019.3 project?

any help or tips appreciated!

EDIT- solved. Unity had apparently deactivated internal audio since there was an FMOD integration present. switched it back on and once the Listener component was added i could see all the plugins again.