Hi, and welcome to this forum. It would help if you included your specs (SONAR version, Win version, CPU, CPU, Audio Interface etc). See my signature.
Do you have latency during playback or recording?
If you go into Preferences ("P" while SONAR is open), Audio, Playback and Recording. Which driver mode do you use?
And which Mixing Latency do you see in Driver Settings?
The more info you give, the easier it is to help.
All the best.
Edit: Wrote this while Chuck wrote his