A while ago, Katrien Van Opstal asked me to proofread her new vocal technique book. I used to be her student and she tested her new approach during our lessons.
Her book explains your voice as if it were a mixing table: it's such a useful tool! You gain a lot of insight in all the anatomical parts that can be used to manipulate your sound.
I am very honoured to be a teeny tiny part of this process and I would encourage all singers to order this one! You will love it.