There is a lock switch on the rear of the pedal that when engaged prevents any adjustment to the controls - ideal for live use to prevent accidental changes.  This locked state puts the pedal into preset mode meaning that the foot switch acts as a preset selector.  Cleverly in this mode, the patch changing direction alters depending on the location of the pedal i.e. toe down patches increment upward, heel down patches decrement.  Bypass requires a long press on the foot switch.  This long press duration is adjustable as are many other functions within the custom settings area of the pedal.  An upcoming firmware update will introduce a new operation mode which allows the pedal to be engaged by simply rocking pedal forward and disengaged by returning it to heel down. In this mode the switch acts as just a preset selector.

Modes

1.Pedal.  Can be used as a traditional wah or for filter sweeps.

2.Envelope.  A dynamic filter that responds to the players picking intensity. The harder you play the more the filter opens or closes depending on the settings.  Many auto-wah effects can be achieved this way.

3.LFO.  The LFO generates a clock signal which automates the opening and closing of the filter with various waves shapes available including a very interesting trapezoid mode.  This waveform has a configurable attack and release.  The LFO rate can be set by numerous methods including tap tempo, a set BPM and external sync via the USB.  This is handy if you want to lock the LFO to your computer software's tempo.

4.Pitch Tracking.  This is a Sonuus original as it features their own pitch tracking algorithms as used in some of their early pitch to midi products.  This allows a function similar to key tracking on a synth where the filter opens the higher the notes you play (or vice versa).  It can also be set to pitch bend mode where the filter opens only when a note is bent, this can be set to follow the pitch over up to 3 octaves.  Great if you have a whammy bar!

Summary

An excellent sounding and incredibly well designed pedal that offers a unparalleled amount of adjust-ability that is more in line with analogue synthesisers than traditional guitarists stomp boxes.   Don't let that put you off though as it is very easy to use and the clear layout means that even when the pedal is on the floor, you can see exactly what is going on.  The software editor is the icing on the cake in this department as it is extremely well thought out and allows for an excellent editing experience.  A highly recommended unit that should give the user many years of wah and filter action of the highest calibre!