Waterfall has 4 channels, each with its own filter, LFO and delay. 

The cut-off of all filters can be modulated by the LFO. The GUI is divided into three sections: On the top left there are basic controls for input/output levels and the stereo expander. The bottom left controls set the level of all channels. The four horizontal strips on the right are the four effect channels. The effects applied to each channel are mixed in the final output.