Hi @Tennant,
As other user have mentioned, it appears that you are using the Android OS mixer here which is limited in sample/bit rate. We are currently in the process of overhauling our Android App and the changes we make may help with this issue as well, but I can’t say for sure. The best place to track our Android progress would be in the Release Notes Section of this site and once the updated build has been tested and published we can take another look at this specific issue.
– Noris