Hi Mischa
Which one is better: PreFader or PostFader?
Because I don't know where "pre" is within your mix I wrote about some general mixing possibilities below.
Reverb-Concepts
First of all you need to know that you have a lot of possibilities for using reverbs in connection with samples. And further, it counts the result and not the concept. So no concept is wrong or right at a first glance
Nevertheless, there are some concepts which will lead to better results than others.
A second point is probably important. Reverbs can be used either for A) adding a bit of reverb for having a nice sound or B) you need reverbs for creating a certain depth of a concert hall.
A) Users normally install a reverb within a FX-Channel. By sending a part of the signal to this Reverb they adjust the reverb ratio for a certain instrument.
Advantage of A) You use just one reverb effect (less CPU-Power) Disadvantage: With this reverbaration concept you can't create a good simulation of different depths.
B) Users often install one reverb per depth. This means you create for example 3 different BUS-Channels (Group-Channels). Each of them gets a reverb which is trimmed to simulate a certain depth by using a certain balance between the direct singnal and the Early Reflections and by adding a certain amount of tail. After that you are going to route all the instruments through their corresponding depth...
Advantage: You are able to create depths with a high quality. Disadvantage: You need more CPU-Power and the system is more complicated.
And how to pan now?
Once you have installed your reverb system (either A) or B)) and your instruments already got its certain reverb you are going to pan instrument by instrument to its place your virtual stage.
Example: Left with depth2. I recommend to pan always together with the reverb.
Hope my text helped a bit.
Beat
BTW There was a similar discussion in the VI-Control-Forum. Maybe it will give any further helps...