The Keyboard provides 88 keys for playing Structure Free, six Smart Knobs, and a context sensitive Info display, as well as the Master volume control for the whole plug-in. You can play and control Structure Free by clicking the keys, using MIDI input from a MIDI keyboard, or using MIDI data in an Instrument or MIDI track in Pro Tools. When Structure Free receives MIDI data, the keys reflect the MIDI note input.
The Smart Knobs are special controls which can be assigned to one or more Structure Free parameters in the currently selected patch. These parameters can then be remote controlled at the same time by moving the Smart Knob. This comes in handy for easily designing complex sounds or quickly adjusting a patch to suit your session in terms of feel, timbre, enveloping, or any other sensible sound shaping parameter. In Structure Free’s factory content, each patch has Smart Knobs pre-assigned to important parameters. The Smart Knob can be named in the field above each knob.
Key Switches are special MIDI notes or keys that are assigned to controls and act as a switch. For example, they can switch between different Smart Knob settings for a patch.
The Master control adjusts the volume of all Structure Free outputs to Pro Tools. All patches are mixed down to the Main output by default, and then output to the Instrument, Auxiliary Input, or Audio track on which Structure Free is inserted.
The Info display above the Keyboard section is a context-sensitive text display. When you load something into Structure Free, it displays a progress bar. When loading a commented patch, it displays the Patch comment. When editing controls, it displays parameter name and value.