A: The Z4's four Q-Link(tm) knobs, or the Z8's eight Q-Link(tm) knobs, can be separately assigned to allow flexible real-time modulation of a wide variety of selectable parameters, including amplitude, filter cut-off and resonance, start offset, effect send, sample tune and more. Control of an entire program, or an individual sound assigned to a single keygroup, is possible. Each assignable Q-Link(tm) knob is capable of generating MIDI controller data so that all performance information can be recorded and played back from any sequencer.