[QRO] two tone test question

[rb]

When looking at a two tone test trapezoid from the final amp.

1.  I assume my xcvr needs to be on CW mode, while the amp should be in SSB
mode.  Correct?

2.  What effect does increase or decrease of xcvr audio level have on the
trapezoid?  I assume it distorts it in some way if over or under driven.
What I'm getting at here is what do I look for to tell me if the audio gain
is optimal?

3.  What effect does increase or decrease in rf drive level have on the
trapezoid?  Within the bounds of linearity, I assume it only makes the
pattern bigger or smaller proportionally.  Is this correct?  I further
assume that if I get into non-linear operation, it distorts the pattern.  Is
this correct?

I've never done one of these and am just trying to anticipate what I'll be
encountering.