Call Change Performances Strictly speaking sonic mapping is mroe complicated than what I described there, wihch is better described as partial firing I suppose.
In our sonic mapping we have four bells creating an underlying structure, ringing very slow rounds on four, i.e. 5 6 7 8 or 13 14 15 16 and then different pairs or groups of bells 'hit' each of those. So if you are only doing it on eight, having 3 hit 5 every blow, 4 and 6, 2 and 7, 1 and 8 works very nicely. On 16 the possibilities are fantastic, and Alan Burbidge has some compositions that we have rung on occasion which bringing in multiple bells to hit each of the back bells.