OK, Louder and Higher.  Does this have anything to do with parameters that a musician would use to control their instrument?

The final clue. 

So you've given us 3 clues and I still have no clue...
 
GREG........ HELP!!!!!!!

rtucker55
OK, Louder and Higher.  Does this have anything to do with parameters that a musician would use to control their instrument?

Interesting...Part of your guess is cold and part of your guess is warm. 
 
Okay, here's a bonus clue. Although I'm pretty certain this will only make sense after the announcement:

Everyone gets Angelic Keys for free?

OK, Now I know what it is but, I can't tell...  

bapu
Everyone gets Angelic Keys for free?

 
That is a GREAT guess. Seriously GREAT. 
 
However, Angelic Keys is already part of the group buy, so it's not that. But I will say, you are warm and I'm very impressed.  

rtucker55
OK, Now I know what it is but, I can't tell...  

Funny, but I believe you. 
 

BREAKING NEWS 
Orange Tree Samples' announcement will be made tomorrow. I can tell everyone this, whether or not you completed your purchase, you'll like this news. Guaranteed. Please stay tuned. 

Even more, only minutes ago it was decided that something additional will be added to the Group Buy, beyond what was previously planned (and the subject of prior clues). So everything about to be announced just got better! Consequently, I have a new clue related to this newly added, special part of the Group Buy. Here's your clue:
 

Oops, double post. Sorry.