Not too long ago I tried some Glenmorangie Nectar D'Or with soda (about 30% whisky 70% soda) and I was astonished. The way the flavours opened up!
It's a bit like putting quite a lot of water in your whisky, which I find really opens up the flavours but also makes the whisky totally lose it's 'edge' and go watery/limp in the mouth. Except now the carbonated soda keeps the edge.
I really recommend some experiments with whisky/soda combinations