Threequencer adds an extra dimension to the traditional 2D step sequencer.
The blue frame represents the play head moving through a sequence at the transport's BPM (beats per minute). The yellow frame is the third 'z' dimension that determines which of six separate step sequencers is currently audible. In LFO (low-frequency oscillator) mode, the z position moves periodically. In manual mode you can move it with the slider.
Each sequence can be programmed in the 'pattern' panel, and has its own reverb and filter (cutoff) values. As the z position moves from one sequence to another, it interpolates these values along with the sequences' audio levels, producing interesting effects.
Spin the 3D view by clicking/tapping and dragging. Clear all sequences with the CLR button; generate random sequences with the RND button.