Try to reduce the size of this 2 hitsound files:
- piano1.wav => 1.73 MB
- piano2.wav => 1.73 MB
When I look on to it, they both have more than 5 sec of silent sound which can be cut to reduce the size of the file. In fact, those files have overall 10 sec in length which is very long to be used as hitsound
Also, do you have a plan to add 4K Beginner? It seems unbalanced when you have 7K Beginner without 4K Beginner