I have had a good look at a large number of posts from this community and audio splitting/external mixer mode has been asked for time and time again. Im reading posts from 2018 asking for this to be implemented but still no sign of this option for android users.
According to this post
IOS users have received this feature so im now wondering why the algoriddim developers haven’t bothered updating the android version of the app.
External mixer mode is definitely something that can be achieved on the android platform.