I am fairly new at modding Audiosurf game modes, so I may have missed this among the file. However, there does not seem to be a way to customize the amount of track rendered at a given time. The track is always pre-rendered for the whole song, but it would be cool to be able to limit the amount of track visible at any moment. I know that the track is split up into nodes, so perhaps there is a way to only make a set number of track nodes visible. It could make an interesting fog mode or one where you have less reaction time for incoming blocks. If I missed the location to change this, please tell me, and if not, you are free to share your thoughts on this option.