Cant get audio playback or my piano working with X3 studio.

I was previously using music creator 6 along with an X-Fi titanium HD soundcard and a Yamaha DGX 630 connected via headphone out to microphone in on the soundcard.
 
First I bought and installed the basic version of X3 upgrade, and everything was working the same and all my previous recordings were playing back without needing any tweaking, so I uninstalled MC6 and everything was still fine.
 
But after buying and installing the X3 studio upgrade (and uninstalling regular X3), I started getting heavy distortion when playing my piano through the software, and also had loud feedback with the volume turned to full in windows and on my headphones.
 
So I tried reinstalling the latest drivers for my soundcard (after using driversweeper to clear the previous ones), and now I get no sound from the piano through to the PC, and when I try to play any of my recordings in X3 studio, I get an 'Unable to open audio playback device. Device may not support the current project's audio format or may be in use' error message. 
 
The fix is prbably something simple, but I cant find it. I tried looking through the preferences already, but couldnt find anything similar to MC6's microphone input settings.
 
X3 studio does recognise my piano as a midi controller through a USB connection though, but Im not getting any audio connection.

I managed to mostly fix it, the devices list in Sonar was was too empty and only had a few front connectors selectable, but none of the actual back I/O ports on the soundcard.
 
I installed the control panel software for the soundcard and was able to select the microphone channel for the input through there and the piano is working now and the distortion is gone, and this also added all the rear ASIO inputs and outputs to the preferences in Sonar.
 
Now I can record and playback new audio tracks from the piano, but I still cant open any of my old ones that I recorded from MC6 and am still getting the same error message. 
 
 

It seems that there are ASIO drivers for your sound card.
 
1.  Are you set to a driver mode of ASIO in Sonar?
2.  What are the Sample Rates set to for both Sonar and the audio interface?  (They must match)
3.  What ASIO Buffer Size are you using as set for your sound card?
 
Bob Bone
 

I just checked in my soundcards control panel and it is able to automatically switch its master sampling rate between 48 and 96 kHz (recorded a test session in 96 kHz, closed Sonar, changed setting to 48, reopened the project and the soundcard automatically changed to 96 kHz).
 
And all the drivers are Asio. Im sure the problem is with my soundcard setup somewhere though.
 
Another annoying issue Im now having is that whenever I try to record a track, it also records the metronome and any audio from other tracks. I tried turning off creative's 'what you hear' thing which is usually the cause of this, but its still happening.
 
I wont be able to afford a new audio interface now either, as I also just went and paid for the melodyne editor upgrade for $149. I'll just keep on tinkering and see if I can fix it somehow.