Drumgenius is a great app. 400 great sounding drumloops, it's great for practicing odd meters and the cool thing is that the patterns is played like different drummers. For example you have ''7/4 Brian Blade on still punching that rock'', ''11/8 Ari Hoenig on Arrows and loops'', 11/4 Eric Harland and many more. Than there is also a lot of different 4/4 swing and even patterns based on Elvin, Tony Williams, Art Blakey, Jimmy Cobb and many more based on the modern guys. Great and pretty cheap. I found it very helpful practicing odd meters because I always find it difficult to practise that with the metronome.