@Michael-Valdez Check the audio driver settings in the System Settings. You could try to change to a different audio driver and then back to your original driver.
If this doesn't help you can try to reset the program settings by importing the default settings via the Import/Export option in the System Settings.
Usually I use the software to make CDs, imagine that. I remember is Samplitude 6, I could “bounce” a selected object to a WAV or MP3. I don’t see that option on Samplitude 3 Pro. I don’t find it in the help menu. Can Bounce to Hard drive be done?
Click on the object, then set click the Freeze checkmark box in the object editor. This will convert a MIDI object to an audio file or renders all effects on an audio object into a file. The files should be saved into your project folder. The settings for freezing can be found in the program settings.
Also check File > Advanced Export and Track Bouncing if the first option isn't what you want.