I realize it is not a proper answer to your question, but just in case you are not aware, there is an excellent third party app that works with the Avantis on Android. It is called Mixing Station and while there is a nominal license fee (I think it is about $12), it is 100% worth the cost IMHO. Honestly I much prefer using Mixing Station over the OEM apps.
Mixing Station has a lot more features built in than the OEM apps (or even the console) – one of which is the ability to save an entire channel to memory for recall later. You can select which elements of the channel you want to recall which makes it very convenient to use.