Digital BW, The Print

OK. Let me ask again. If you look at the Paper lever you will notice 
A Paper symbol with a notch. An Envelope symbol and a notch. An 
unidentified notch just below the Envelope notch and, of course the 
bottom notch which allows you to feed in the paper at the back. MY 
question then is, what is the third notch under the Envelope notch 
for. I see that it lifts up the head just a bit more than the 
envelope setting. Secondly, which setting should be used for the 300g 
Entrada, the envelope or the unidentified notch. And, finally, in the 
instructions, it tells you to do your alignments on a plain piece of 
typing paper. If you are using 300g paper, should you do your 
alignment with this paper installed and the paper lever set to what 
ever is the correct setting(?)?
thanks,

John H