I'm sorry but this just doesn't seem to do anything. Further, there are no instructions provided whatsoever.
What do the sliders for the various instruments up top do?
What are you supposed to do at the bottom there? My assumption is it's supposed to be like guitar tab. But okay I put some numbers in there, I click on Play and nothing happens. No sounds. That red vertical bar very very very slowly advances to the right. Even if it was bad lag, still no sounds even when it crosses onto where numbers are.
And this is far too huge. Please consider not everyone uses a huge HDTV as their computer monitor.
In short, you need to provide better instructions, scale the size way down, and sound needs to work. I assume it works for you or others. It doesn't work for me or at least I can't figure it out.