Have you turned the volume punch through on? I believe it works in SAT mode too. If not, simply 'key move' the TV's volume buttons over to the SAT device.
I don't know what an interest button is, so I can't help you there, but if there are buttons that are not automatically programmed when you set up a device code, these can probably be re-created using advanced codes. To help you further I would need to know what device the "interest" button is for and what device code you used to program that device into your C7.
You can answers to questions like these, and much more on my site.
Rob.
http://www.hifi-remote.com