Compressing Pitch Range
In this example the black notes are 1 octave lower than the blue, and the red notes are 1 octave higher than the blue. So the blue are half way in pitch between the black and red. I want to compress this (piano) range to arrange for guitar.
If I drop the the red notes by 1 octave is there any way to transpose the blue notes down so that they remain half way in pitch and still sound right? I tried dropping them all by six semitones, (i.e. half an ocatve), but they sounded wrong - out of tune.
(I realise that, as it stands, these notes are all easily playable on guitar but there is a bass voice to incorporate too and this would make the stretches too large.)