[soyyo]

sorry but I learnt this in a music school and using paid materials I don't know where you can find this well explained.

I've done a quick look and i've found this videos that I think are ok as starting point:

https://www.youtube.com/watch?v=aDD4q9xd8Ac https://www.youtube.com/watch?v=ImFFi_QBnUs https://www.youtube.com/watch?v=mWpXy57-mvc

Hope it helps

[dwaltrip]

Thank you! I will try those videos out.