I thought I would share a program I use regularly that I can control my stereo and works with a majority of android apps.
It is called: AMIDuOS And http://www.amiduos.com/

it looks like they are discontinuing selling the software so is free now. I purchased the Pro version for $15 lifetime. This allows me to use my Yamaha receiver with their Yamaha's app. So I can control my stereo receiver and use all their features. That along with most other android apps.

Well I just thought, I would share what I think is a hidden gem..