drhauser
  Has anyone found Cakewalk's support to be helpful?  They don't appear to even take emails anymore.

Support for X1 was discontinued by Cakewalk around 2013. Gibson shutdown Cakewalk operations in Nov 217. Earlier this year BandLab purchased Cakewalk IP from Gibson and released a product based on SONAR Platinum. Cakewalk by BandLab is free, supported by BandLab, can read your SONAR projects and take advantage of everything bundled with X1. If you are looking for a manufacturer supported product consider upgrading to Cakewalk by BandLab using BandLab Assistant (requires a BandLab account which should be setup using the same email as your Cakewalk account).

1. You can test your Sonar audio path separately from any MIDI equipment by just dragging an audio clip into an audio track in a test project in the DAW, and playing it.  Do you hear it play back over the speakers connected to your Fast Track?
 
2. When you play a YouTube video or an MP3 media player in Windows, the sound is sent to the audio device configured in Windows, rather than Sonar.  Have you configured Windows to use the Fast Track device for default Windows audio? If it is defaulting instead to the onboard audio chip and you don't have the speakers connected to that you will hear nothing.  Also make sure you used the same sample rate for Sonar and Windows.
 
Your MIDI interface and MIDI settings should not have any bearing on this issue.  This is an audio only problem.
 
Good luck!

drhauser
Has anyone found Cakewalk's support to be helpful?  They don't appear to even take emails anymore.

You've been trying to contact a ghost company. SONAR is no longer in development. Cakewalk as a company no longer exists.
 
This forum is being kept running as a courtesy by BandLab, the company who bought the intellectual property associated with the Cakewalk company, including SONAR.
 
They have a freeware program called Cakewalk by BandLab that is based on the old SONAR Platinum code and is backward compatible. It includes many bug fixes and several new features since SONAR Platinum was released.
 
It is yours for free. Go to http://www.bandlab.com/ register with the same email you used at Cakewalk. You install a little downloader program called BandLab Assistant and it will download and install Cakewalk by BandLab for you, right alongside SONAR X1, and then you can use both of them if you want, and even have some features from X1 that aren't included with CbB.

Hello all, 
Thank you all for your help!  I've solved some of the issues thanks to your responses.  I can now bounce between Sonar and other applications and hear audio in both.
I have a new issue that I'll open a new post for.  If this isn't the correct etiquette and I should keep all my questions in the same thread, please let me know.
Thanks again,
Dan

Glad to hear you got it sorted. New post for a new issue is generally a good idea.