To answer all questions, or at least try.

1.) I only use Real Band to generate usable backing tracks. Except for drums, I always want those tracks to be in mono, so I go into Audacity after the export and do stereo to mono and resave the tracks if those tracks rendered as stereo in Real Band (and were exported that way.)

Some people use plug ins to reshape stereo tracks inside the DAW but I find that to be a nuisance. I want my tracks (except for drums) to be in mono so I can pan them where I want them. It is just my preference.

Again, this is just my way of doing things.

2.) The question of "Mono left" might be confusing. When I say 'mono left" I mean I am simply using the left channel input on the audio interface to record a mono track, and again--and this is just me--I prefer all the audio tracks except for drums to be in mono.

Then once I have them in Sonar, I pan bass just slightly off center, main vocals straight up, drums straight up, doubled vocals at 10, and -10, main instruments at 25 and -25 and sweetening instruments at 30, -30, or sometimes -35, and 35.

Bob Buford just wrote an excellent column on this in the recording forum.

I hope this makes sense!!!