question about mastering

Some more details please, ie, are you applying this as a VST on your master bus, or just on a particular track ?
A VST plugin should work properly in most of the major DAWs, Sonar Platinum included.
Since you ask, myself, I usually use "iZotope Ozone 8 Maximizer" on the Master Bus, when limiting inside Cakewalk.

A VST that "only works with certain DAWs"? Baloney.
 
Yes, some plugins have had bugs that only show up in specific DAWs (been awhile since we've seen one), but a standards-compliant plugin that doesn't work in a standards-compliant DAW sounds like the support person was blowing you off. 
 
It's called a "classic" clipper because it has a Gain control rather than a Threshold, similar to classic compressors such as the LA-2A and 1176. That means you have to crank up the input in order to get it to work. 
 
As for which clippers most people use, I may be wrong about this but I think you'll find that most people don't use them at all except in specific genres such as EDM and Hip Hop.

bitflipper - 
 
I record at low volumes, so I need the track to be louder.  What do you use to get the track louder?
 
Thanks!
Greg

What do you mean by "I record at low levels"?

It seems to me most peeps capture at around the -12dB mark peaking at -6dB and no lower than -18dB which is the figures I aim for. 

If you mean limiter, I use Waves L3 Multimaximizer, but I haven't quite "mastered" (meaning the plugin, not the music) it yet.
 
John B.

The Concrete Limiter is NOT bundled with CbB. Plug-ins bundled with CbB are documented here.

That's perfectly OK to keep levels low. That's what the mastering phase is for, bringing up the volume to suitable levels for the distribution target, e.g. MP3, AAC, FLAC, or WAV for CDs. And the limiter is the primary tool for that.
 
There are many choices available, from free to cheap to moderately expensive. I'd suggest trying Limiter No. 6. It's free, and even has a built-in clipper if you want. The downside is that it's not the easiest limiter to use, but spending some time figuring it out is a reasonable tradeoff, given the price.

I haven't seen this mentioned yet, but although a limiter (compressor with massive ratio and typically high threshold) will crush audio, the level of the signal into that limiter is incredibly important.

The audio going in should be on par with what the limiter is designed to work with (so the threshold is actually seeing signal cross it), but I haven't seen (or blindly missed) mention of fader adjustment in this thread.

Volume alone will blow ear drums, no compression/limiting required. What compression/limiting does is raise the overall output by removing dynamic range. Because of the "don't clip" boundary, a fader can only take you so loud (which is where the limiter comes in). Just be careful of the signal in (don't feed a limiter a weak signal and compensate accordingly), and settings on that limiter.

Jeff Evans wrote an exceptional post on compressor set up long ago, but I am on my cell so will never find it.