How do I change tempo of clip?

I think what you're after is groove clips which follow the project tempo.

Click Here for Looping Help

This is a link into the help file. You need to convert your clip into a groove clip. so... there are some tricks to making this go well as described in videos and books. The basics are related to how stretching happens as the clip is stretched. There are things called transients. If you set the transients correctly, then you can adjust the clip to any tempo and it still sounds good.

Check out the Sonar books and videos or just read the help file on groove clips. Take the time to correctly set your transients. Execute a bounce to clip as this makes life better. I think ctrl L converts the clip to a looping clip.

anyway, read the help file. I've only done this for yucks.

You can also use DSP. Hold down the Ctrl key and slip-edit the clip, e.g., it will become shorter if you're going from 95 to 110 BPM (the clip edge shows a yellow line to indicate that you're stretching the clip).

The fidelity will suck because it's a preview. So click on the clip, type A for audiosnap, then under the Offline drop-down menu, select Radius Mix. Bounce the clip, and Sonar will do the offline calculations needed to do a much higher-fidelity version.

This is almost always preferable to doing a groove clip with sustained sounds, or instruments like bass. For percussive clips, like drums, it's often worth taking the time to create a groove clip.

The crucial aspect of groove clips is that they will follow tempo changes. With DSP stretches, you have to re-stretch if the tempo changes.

I should have added that you'll usually have higher fidelity speeding up a slower clip than slowing down a faster one. The same is true for groove clips; it's easier to remove sound to make something shorter than to add sound where sound doesn't exist to make it longer.

Also with groove clips, drop the level a bit. The crossfading can produce additive results that generate peaks higher than the original, ungroovy file.