Hi. I just started taking the KTVA singing course and I have to say it really helps a lot and I have a question on singing. For some reason when I do the vocal exercises in volume 1 and practice singing a song my voice starts to sound a little hoarse. I have good posture and I'm singing from the diaphragm. Is it cause I need to drink more water or is it the songs I'm singing? My voice also starts to sound hoarse towards the end of the exercises to.