Spili is a lo-fi / filter effect.
- The big tuner knob moves the limited frequency area that will be amplified.
- Turning the "Age" knob up creates a more muffled sound.
- Lowering the mix knob brings back some of the original signal.
- The volume knob can be used to avoid digital clipping when you want to emphasise a frequency that is allready very present in the original signal.