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Dave Smith Tetra

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    Description
    Four Multitimbral Voices of Analog Power

    Tetra takes the award-winning sound and features of Mopho, multiplies them by four, and packs them in a box less than half an inch larger!

    Tetra has multiple personalities. It is a four-voice, analog poly synth, a sort of “mini Prophet.” It’s a four-part, multitimbral synth with separate outputs, essentially four Mophos in one very compact box. And it’s a voice expander for other Tetras or the Prophet ’08.

    + Affordable, fully programmable poly synth with a 100% analog signal path.

    + Classic, real analog sound—including legendary Curtis analog low-pass filter.

    + Four-part multitimbral capability with four separate outputs.

    + Combo Mode for huge unison patches, stacked sequences, and “modular-style” poly sounds.

    + Expandable: poly chain with other Tetras, Prophet ’08, and Mopho for expanded polyphony

    + Just 7.9″ x 5″ (20.07 cm x 12.7 cm).

    Outside the Box

    Physically, Tetra is similar to Mopho, with four assignable parameter controls per program and a row of controls dedicated to the most commonly used performance parameters. All of the parameters can be accessed from the front panel and Tetra is fully programmable. A free, downloadable editor is available for Mac OS and Windows to facilitate more comprehensive tweaking.

    Most of the rotary controls are detented encoders, but Cutoff and Resonance are potentiometers, allowing full sweeps with a single turn. The Push It button is a manual trigger to play notes and latch sequences on without the need for a MIDI controller.

    Audio is output in mono, stereo, or per voice, via the four audio output jacks. There is also a headphone out. MIDI communication is by standard MIDI in and out jacks or USB. Poly Chain Out is a special, dedicated MIDI output to chain multiple instruments for increased polyphony.
    Under the Hood

    The voice architecture is based on the Prophet ’08, but with the addition of a sub-octave generator for each oscillator and a fully programmable feedback loop for each voice. That breaks down to two DCOs, a resonant low-pass filter, three DADSR envelope generators, four LFOS, deep modulation routing, an arpeggiator, and a 16 x 4 analog-style step sequencer per voice. Feedback is capable of producing effects ranging from mild distortion to fairly extreme harmonic instability. (That’s a good thing.) The possibilities are nearly endless. And the audio signal path is 100% analog.
    Tetra a la Mode

    In Program Mode, Tetra is a four-voice, polyphonic synthesizer with four banks of 128 programs. As with the Prophet ’08, each program contains two layers—each layer is essentially a separate patch—that can be used to create keyboard splits or stacked sounds. Banks 1 and 2 are the Prophet ’08 factory programs; banks 3 and 4 are a combination of Mopho and new programs.

    In Combo Mode, a different program can be assigned to each of the four voices. Combos can be used for mammoth unison patches or for triggering up to four different 16 x 4 sequences—each with its own program—simultaneously. Combos can also be used to create “modular-style” polyphonic patches, where each voice plays a different program, with a slight variation on the same sound or even a drastically different sound.

    In Multi Mode, Tetra becomes a multitimbral sound module capable of playing four monophonic parts on four MIDI channels, with separate outputs for each voice. Coupled with a MIDI sequencer and DAW, Tetra can play complex arrangements or analog drum parts with each part individually processed and recorded to its own track.
    This One Goes to 12…and 16

    Up to four Tetras can be poly chained for eight, twelve, or sixteen voices total. When used with a Prophet ’08, up to two Tetras can be poly chained for a maximum of sixteen voices. In addition, the Prophet’s front panel controls map directly to almost all of Tetra’s parameters, so the Prophet acts as a programmer and control surface. And a Mopho can be connected to Tetra’s Poly Chain Out for five-voice operation.
    Images
    Architecture
    Type: Analog
    Synthesis: Subtractive
    Oscillators: 4
    Waveforms: Pulse, Saw Up, Square, Triangle, White Noise
    Oscillator Notes:
    Digitally controlled.
    Two Sub-Octave Generators:
    one sub-octave below oscillator 1
    two octaves below oscillator 2
    Envelopes: 3
    Evelope Paramerters: Delay, Attack, Decay, Sustain, Release
    Filters: 1
    Types: 12dB Slope (2-pole), 24dB Slope (4-pole), Low Pass, Resonance
    Filter Notes:
    Curtis filter chip.
    Audio rate modulation.
    OSC 1 Frequency Modulation.
    Self-oscillates in 4-pole mode.
    LFO: 4
    LFO Parameters: Noise, Saw Up, Saw Down, Triangle, Clocked, Key Sync
    Polyphony & Tuning
    Polyphony: 4
    Timbrality: 4
    Patches
    Patches RAM: 512: 4 x 128 banks
    Storage: Internal
    Editing: MIDI
    Arpeggiator
    Arpeggiator
    Sequencer
    Step sequencer
    16 x 4
    Gated
    One sequence per program
    Case
    Case: Desktop
    Controls: Knobs
    Display Notes: LCD: 16 x 2, Backlit
    Dimensions (WxDxH): 7.9 x 5 x 2.7 in / 20.07 x 12.7 x 6.86 cm
    Weight: 1.8 lb. / 0.81 kg
    Connections
    Audio Output Connections: 1/4" Phone Jack, Stereo Main, Stereo 2, Stereo Headphone
    Inputs: Mono 1/4″ TR
    MIDI Ports: IN, OUT/THRU
    Power: DC 13V 220 mA Positive Tip
    Production
    Year Released: 2010
    Design Notes:

    Designer: Dave Smith
    Manuals & Documents

    Product Links
    Company Product Sites:
    [+] www.davesmithinstruments.com
    Reviews
    Editors & Software:
    [+] www.soundtower.com
    Pricing
    MSRP List Price: $799 - convert
    Retail Street Price: $700 - convert
    Used Price: $400 - $550 - convert
    Shopping
    YouTube Videos
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