Thanks guys. Much appreciated! From most of my stuff I simply think it is not good enough, and so I tweak them forever, including a total replacement of a sound I suddenly think is not good enough. And since I don't use presets, sound design takes some time. When done, I probably find a melody or some chords not working anymore. Well, a neverending story
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I'm sure a simple application exists somewhere. But my way is a bit more complex. I use Cinema4D. It has a realtime fft directly processing items' x, y, or z-axis. The object is called "sound effector". You can do a whole lot more though, than just the boring thing I did. For example: http://greyscalegorilla.com/blog/tutorials/animate-with-music-using-the-sound-effector-in-cinema-4d/