FabFilter Twin 2's interface is divided into multiple sections:

Presets, undo and A/B
The Undo, Redo, A/B and Copy buttons at the top of the plug-in interface enable you to undo your changes and switch between different states of the plug-in. With the preset buttons, you can easily browse through the vast library of factory presets or save your own settings so you can re-use them in other songs.
Synth section
The top section is the actual synth, the sound-producing heart of the instrument. Here you'll find the oscillators, the filters and the delays logically displayed, together with general settings like portamento, master tune and volume controls. Each component of the synthesizer is represented by a component button that shows its state and lets you edit it directly.
Modulation slots and sources
The bottom section contains the modulation overview. Twin 2 is a fully modular synthesizer without the cables! We found a simple way to show you everything that is modulating, and what is modulated by what. Above each modulation source, the modulation slots show exactly what targets are modulated by this source and let you adjust the amount of modulation. You can very easily set up modulation connection with drag-and-drop. All in all, we think we made sound design easier and more fun!
MIDI Learn, monitoring and output mix
The bottom bar contains the MIDI Learn feature which sets up any MIDI controller to control any plug-in parameter. Next, we find various polyphony and unison settings which give you the possibility to create super-fat sounds. At the far right are stereo spread and output level settings.
Presets
With the preset buttons, you can easily browse through the factory presets or save your own sounds so you can re-use them in other songs. See also Presets.
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Next: What-you-use-is-what-you-see
See Also
Quick start