Don't know much to really help, but for Miku, it almost sounds like she has a sore throat at times.
Oh, yeah I listened to some of your covers in youtube, and I wanted to let you know that you need to work on mixing. The vocals are too harsh on most of them where it almost like pops...?
In fact, I was wondering if you can remake your cover of "Je T'aime" I really like the cover, but I noticed that it hurts my ears because of the mixing. And so, I sometimes skip it (I have it as my Writing Playlist. ^^;), but I really wish to continue having it since it could be smoothing and nice to listen to for the writing mood.
