Truly, a lot of presets come with those Delay and Reverb options turned on. I made sure to disable them, or at least turn their cutoffs down.
For the vocal part, I think it is great as it is, I know the background vocals are drowning, but unfortunately I have no special channel for them, since they are in the whole acapella file. As long as we hear the acapella, nothing is bad, I guess ^^
The second language by the way is Japanese, by a Vocoloid called Hatsune Miku... Maybe you heard of it? It's a bit underground but she does one decent job most of the time...
For the synth, haven't found a better one after ... idk, 45 minutes of searching...
Thank you for the rating, is appreciated :)
EDIT:
Wait...
This has a pretty happy tone to it, which is nice because I like happy stuff.
This is pretty a melancholic song in my opinion. It seems happy, but listening through it's sentences, you feel a kind of sadness... It might be me, but I love melancholy. And this was a great opportunity. I even changed the melody for Hatsune a slight bit.