New to Sonar Pro, Not getting desired volume recording

First what does the meters show in you master buss and output? That what's going out. It should be close to the top if not your tracks are recored too low. Do you use VST instruments, they seem to defult to way too loud how do those compare? 
Not a fan of M audio interfaces. I had one and the drivers always bonked out on me. 
I like Tascam stuff at the lower price points. I have a Scarlett and it's been great too. 
Read my list of things to look for when shopping. 
http://www.cactusmusic.ca/Recording.htm#AI Shopping List
 

Thanks for the replies. My master output buss signal was near the top most of the time. And yes I am using VST plugins. (The thing is I can spend another 1500 dollars on equipment.. I just don't really know the best way to approach recording guitar/bass and vocal tracks thats in my price range.. and space limitations.). It clipped into the red in a few spots through out the song. I had the sliders up between -12  and -4 depending on which guitar effects i was using. I was also using the M2x2M for vocals and the old Rig Kontrol 2 Pedal for the guitar and the Bass guitar.. I did run into a few bugs and some inconsistencies with the software. That might also have some negative effects on the over all volume.. but I don't think so. But for my next recording I am sticking with one USB audio interface. The Pedal ended up doing nothing for me.. I wanted to be able to use effects and switch effects on the same track while recording and it didn't work like that.. Maybe the wah wah or a volume pedal might have worked.. but it was really buggy. So I am going to ebay the pedal unfortunately.. 
 
I also noticed that when I unplugged my PC gaming/music playback sound card from my JBL studio monitors.. it greatly increased the volume. That was an RCA to TS cable.. and then my M 2X2M was connected from a TS to XLR cable to the speaker... so basically what I am saying is the studio speakers had 2 separate connections and it not only effected volume playback but also the recording itself. But and I know this is sort of confusing.. I did not unplug the RCA Jacks from the sound card inside of the PC. So that might be somehow be effecting or interfering with my results. 
 
I am going to ebay the M 2x2M and already purchased the Scarlett 2i4. My next project any sound related wires that are connected to the PC that are not involved with the recording will be unplugged from speaker and the unrelated XFI titanium HD sound card. 
 
I will also try recording at -12 db instead of -6.. and just play with the gain and try to find a happy mix. 
 
Live and learn.. Maybe I will have it all figured out by the time I am 45.

Odds are you'll find a new sweet spot, plenty loud enough. My own experience... I've used M-Audio and Edirol devices, and now use Focusrite 18i20 2nd gen, and all have been way more than sufficient.
BTW I'm selling the other devices 😉.

So who'll mark this "solved"...and then get their hand slapped. 😁😁😁😁