No Volume? – jControl Review

I've been using this app with my Jensen stereo in my RV. It works good, but... You can control just about everything but it doesn't control volume as they advertise in the app's description. It allows you to kick in the "Loudness" button, but that's it. You can control fade, balance, change bands, stations, etc. it's pretty cool so I am puzzled why it doesn't control volume. Maybe I'm missing something?
Review by Mike Luciano on jControl.