Brother, I know how you feel. I've been there, and with lesser things than Vocaloids and Miku. Music is something incredibly beautiful in a world full of so much ugliness. Your love for music, I think, is more on track than one might suppose. Your heart recognizes the Fall, and has clung to one of the things which can truly lift us up to God if done properly. In fact, a very great philosopher I follow, Dr. Peter Kreeft from Boston College, has once said there was an argument for God's existence from beauty. His version of it is "The music of Bach exists, therefore God must exist." I think you may understand that better than I, but I think it holds true.
That said, I do understand your concern as well. G.K. Chesterton, another wonderful Christian philosopher (and hopefully he will be named a saint soon), once said that "every man who knocks on the door of a brothel is looking for God." The corollary to that is that he's looking in the wrong place. Our hunger for beauty can be a snare, and it can be something that lifts you up. It's a matter of where you seek that beauty. That comes down to two things: where you are now, and where God is calling you.
The first point can be summed up by a quote from St. Josemaria Escriva: “God is not removing you from your environment. He is not taking you away from the world, or from your condition in life, or from your noble human ambitions, or from your professional work... But he wants you to be a saint — right there!” Additionally, we can add the quote from Dostoevsky, "Beauty will save the world." Put these together, and maybe you have a bit of hope and direction. If beauty is a gift from God (a grace), and we are to bear grace to the world, then consider bringing that beauty into where you're at. People can't argue with beauty, even if they want to argue with truth. Be the salt and light people starve for in this day and age, because I can guarantee you that you're not alone in your starvation. The sinfulness of the world is proof of that. As is your own sinfulness. Examine your conscience: tell me if you can find any evil in you that is not driven by a desire for what you know to be a good. The goods you seek are merely sought in the wrong way, as an end rather than a means to God. Your vices and virtues will both lead you to where you need to go, if you dig into the root of them and examine what God made you to desire.
Now, as to where God's calling you. God, my dear brother, is calling you to greatness. You can feel this in your bones. This is the pain of your heart. You have vision, a vision of a world better than what you're seeing with your physical eyes. That is in part why you've worked so hard in your ministry. That is in part why you turned away from certain cesspools. That is in part why you admire the greatness you see in others. I will tell you one thing. I want to see you go where God calls you, because then you will be a saint and a light to the world. You will be like the red lamp that is in every single Catholic Church that tells us that Christ is present. You will be like the Bach music, which shows the existence of God by its very excellence. Seek ye first the Kingdom of God, then all goods will follow.
Brother, have courage in the fear and anger. Persevere, and love our God. In your heart, by your words, and by your deeds shout Long Live Christ the King! Glory be to the Father, and to the Son, and to the Holy Spirit. As it was in the beginning, is now, and ever shall be, world without end. Amen.
As a parting word, know that even when you feel God is absent, and His glory to be muffled, His glory never changes and it will remain with you even when you can't see it. Even if you rejected it (which I doubt you would knowingly do) it would remain. God is here for you, Bro. Don't have to wait for Heaven.