Twin contains two oscillators with triangle, sawtooth, and square wave forms. Hard sync, pulse width, phase sync, and stereo panning are provided, together with polyphonic portamento.

The two independent multi-mode filters in Twin are based on FabFilter's digital filter technology with three different filter characteristics, ranging from smooth with moderate overdrive to extremely raw and self-oscillating. The FabFilter One filter is also included. Low-pass, high-pass, band-pass responses and 12/24 dB/octave slopes are available, and each filter can be panned to create stereo effects without phase problems. Different oscillator-filter routings are possible.

Twin's 24 modulation slots provide flexible modulation possibilities. Setting up modulation connections is simple: just drag a modulation source to any knob that can be modulated to fill a modulation slot. Modulation slots can be inverted and bypassed, and it's also possible to modulate the level knobs of other slots.

There is no shortage of modulation sources with three LFOs, three envelope generators, and velocity, aftertouch, keyboard track, pitch bend, and mod wheel sources. Each LFO has triangle, square, sine, random triangle, and sample-and-hold wave forms, tempo sync in either straight, triplets or dotted mode, note-on sync, and a wave balance setting. The envelope generators have extra delay and hold parameters. All EG parameters and the LFO frequencies can be modulated.

Other Twin features:

• 24-voice polyphony with unison.
• Stereo processing of oscillators and filters.
• Sample-accurate MIDI handling.
• Smart parameter interpolation that ensures responsive yet smooth parameter changes.
• MIDI Learn.
• More than 500 factory presets.