Tantra, that's a good way to do it. I used to have mine set up that way and it worked well. I think it puts the buffer between the source and the preamp; I don't believe it can put it in front of the source component.
In one of my systems I found that components plugged into my tape monitor (not the loop, just the input) sounded better than those selected by the rotary selector switch. That could be worth exploring. Also, if you like the sound of your system better with the tube buffer, you could try putting it between your preamp and amplifier; but that way you wouldn't have the option of switching it out.
The main thing is to experiment and have fun!