For folks who know battery:
I have set up my own drum set.  It has the maximum number of pads (8X16).    I am trying to use it with the step sequencer and/or piano roll.  It seems to have more pads than there are midi numbers available.  First of all, note that there is a 2 octave change in the mapping:c3 is mapped onto midi 36 in the step sequencer, and midi 60 in battery (although it is still called c3, I don't recall whether I changed it).
   In any case, battery uses B1 etc, as well as octaves labelled 0, and down to -1 and -2.  I add a row to the step sequencer below c2, and move it down to b1.  Now it is labelled "Unmapped (23)".  When I click on it, it plays "B1" in battery, but when I enter a bunch of notes there and hit the play button, they don't play.  When I add a C#7, it won't play at all, even though there is a c#7 in battery.
   Anyone understand how this all works?  Obviously I'm missing something.  Thanks.

There is a setting in Sonar Preferences where you can tell it which octave to use for pitches:
 
Preferences>Customization>Display
 
And there the parameter is: Base Octave for Pitches
 
The default is '0'.  Here is the documentation snippet for that parameter:
 
"Base Octave for Pitches. There is no industry standard for numbering octaves. By default, SONAR calls MIDI note 0 (the lowest possible note) C0. The Yamaha FB-01, for example, shows MIDI note 0 as C-2 (C negative 2). To match SONAR to that standard, set Base Octave to –2." 
 
And, here is the link to that page in the doc for X2:
 
http://www.cakewalk.com/Documentation/default.aspx?Doc=SONAR%20X2&Lang=EN&Req=Dialogs2.073.html
 
So, you can try changing that octave and see what that does for lining things up for you.
 
Bob Bone