Hey I was thinking about buying studio but I'm using an mpc and I would have to play my whole track over and over to get each layer into the software so to have them line up properly I was wondering if you can arm sonar to record when the input volume hits a certain threshold. You can do this on the mpc and its extremely useful, i don't see how else the tracks would line up perfectly. thanks!

Welcome to the forum.
Not that I know of.
SONAR Home Studio is no longer available, unless you can find an old version in a bargain bin or on Amazon.
Now they have 3 different versions of SONAR X or Music Creator 6.

I though the latest was x3 studio? that's what I am referring too. Is there any other function that would make it possible to play the mpc song over and over until each layer was a separate audio track, and have them all line up perfectly?

Right, X 3 Studio is an entirely different program from SONAR Home Studio. SHS has been discontinued.
But your question is pertinent to all the Cakewalk DAWs, I think, and no, I don't think there is anything that will do what you want automatically. You would have to record each 'layer' seperately into different tracks in SONAR and drag them so they line up.
Also, I don't have any of the X series of DAWs, so try the SONAR X forum. Things have changed a lot since I bought SHS 6 and maybe someone with X 3 Studio will know more about it.

Without knowing what's an mpc:
To line them up there could two options.
-Add "fake data" or audio in the beginning of the tracks or otherwise make them all start at the first bar.
- If you can export the tracks as broadcast files, which include a time stamp, they would be positioned correctly.
 
If mpc is a MP3-recorder, neither of those will work, though, I assume.
 

Some good ideas from Greg and Kalle.
I had to Google MPC.
Depending on how the MPC saves your tracks, the transfer may be relatively easy.
It looks like the MPC is essentially MIDI driven internally. Is that correct?
Is it capable of saving the individual tracks as wav files?
I think the trick is not going to be so much getting the tracks into Sonar, but getting them out if the MPC.

I figured out how to do it, just need to slave the mpc to sonar and get them clocked together. still having issues but this problem is fixed thanks guys