The Bass Station II Monophonic Analog Synthesizer from Novation is a 25-key synthesizer with assignable aftertouch that, while designed for bass synth sounds, is also capable of leads and arpeggiated performance. It features two analog oscillators as well as a third, sub-octave oscillator. The tones its oscillators produce can be modulated, shaped, and altered by the Bass Station II's Classic and Acid filters, dual ADSR envelope generators, 2 LFOs, and analog distortion. The synth has a built-in arpeggiators with 32 different patterns and a 1 to 4 octave range. The step sequencer provides another playing style with up to 4 different sequences. The Bass Station II's front-panel controls gives you hands on access to all of the synth's editable parameters. Your edits and created patches can be saved to the 64 user patches for fast recall. Oscillators: Bass Station II is built on three analog oscillators and a noise generator. There are two fully independent oscillators plus a sub oscillator. Oscillators One and Two are switchable between sine, sawtooth, square and variable pulse width, and Oscillator Three - the sub osc - can be set to one or two octaves below Oscillator One. It can be square, sine or narrow pulse width, delivering the characteristically 'fat' bass tone. Filters: You can select between two discrete filters - 'Acid' or 'Classic' - each with a built in overdrive for pushing filter tones from dry, to warm, to nasty! The 'Classic' Bass Station filter can be switched between low pass, high pass and band pass at 12 or 24 dB slopes. The 'Acid' filter is based on a diode ladder filter design that delivers a characteristically 303-esque sound that is designed to squelch.Bass Station II has two effects (not including the filter overdrive). Analog distortion drives circuit components to add new frequencies to the sound. The second effect is 'Osc Filter Mod' which creates a distinctive FM-type sound by using Oscillator Two to modulate the filter frequency.