Thank you all. I finally got it. With best regards to Cakewalk Gurus.

Good news!

While recording vocals with pre-recorded tracks, how can I listen to my own voice.  I switched on the echo on the vocal track but delay was annoying. Any help and suggestions will be much appreciated.

My sound card has the ability to rout recording sound directly out before it hits the
recording software. Before that, I had to use a mixer before my sound card and monitor off of that.

What kind do sound card do you have?

Thanks. I have Prsonus audiobox 22vsl

Use the Audiobox headphones and adjust the balance between computer and input with your MIXER control. 
If you turn on input echo you'll hear your voice after it has gone in and back out the other end with all the latency that resulted from conversion and processing. That's why we use direct monitoring at the interface. 

Cactus Music, thanks a million. Appreciate taking time to help someone in need. Regards.

During editing if i want to lower the volume of a small portion of the audio trak by 3db, how do I do it. Similarly if I want to increase the volume how do i do it. Thanks.

That is what the track volume faders are for. You may also want to check out Automation in the Sonar manual. 

I did not explain right.  What i am trying to find is that if I want to lower or raise a note by 3db or 6db how do i do it?  i the old cake walk that I used it had an option to raise or lower a note by 3db or 6db.  Thanks.