melodeon net is a good idea. I wish I could draw diagrams on this set-up -you should be able to get as well as the obvious chords Am on the pull using A and c , Em on the pull , and probably Bmaj or min on the squeeze, depending on your set up -you could alter the chords by having the middle note retuned - You should also be able to do a scale C D E () G A B - the F#(m) on a 12 bass 2.5 or 3 row is useful in G and D as you can do bass run fill-ins. If you play an Em you can add a G note to it which is an interesting chord.
Try going to Andy Cutting's web page -that'll make your mind boggle!