
Sorry but you cannot stack notes over the chords.You would need editing software to do that.I use editing software to stack chords like Fm/Db and Cm/Eb. Now you could do it if you had editing software using Jamstudio.You could record the first part in B the second part in G now all you do is put B on track #1 and G on track #2 and play then at the same time.You can make your own bass loops by using Jamstudio loops:
http://www.jloops.com/index.htm check out the bass loops at the top right!