I will try Wikipedia as a future reference. I was pretty sure that I needed to eliminate the 3rd note because it tends to create a dissonance with more complex chords. 1 and 5 seem to provide a better harmonic basis for more complex chords - to my ear, if not to the theorists!
Interesting though that 'guitar' chords don't necesarily transfer straight across to psg - maybe it's only having three (usually) notes available on psg?


