Im a middle school band director with a jazz band (occasionally two). My students use two electric kits with headphones to practice on. When they are ready to join the band I let them play the acoustic set. Ive always taught drummers through grooves and fills. This app is awesome for a young player! It has a variety of styles. I just want MORE grooves. Theres 2-5 for each style. For example, a young player needs to learn coordination on 8th note rock grooves. Theres only 5 grooves for this offered. I would love to see 40+ in additive combinations with syncopated, then dotted quarter. And if you add 1,2, and 3 bar fills I will be VERY grateful :)