- Affordable, fully programmable poly synth with a 100% analog signal path.
- Classic, real analog soundﾗ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).
- Free editor for Mac OS and Windows.
Tetra is the next-generation analog poly synth. 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 ﾓmini Prophet.ﾔ It’s a four-part, multitimbral synth with separate outputs, essentially four Mophos in one very compact box. And itﾒs a voice expander for other Tetras or the Prophet ’08.
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ﾗeach layer is essentially a separate patchﾗ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ﾗeach with its own programﾗ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
Multitimbral four-voice analog synthesizer
100% analog signal path
Two oscillators per voice (sawtooth, triangle, saw/triangle, square with variable pulse width) with hard sync
White noise generator
One classic Curtis low-pass filter (switchable 2- or 4-pole) per voice, self-oscillating in 4-pole mode
Three envelope generators (ADSR plus delay) per voice
Four LFOs per voice
Two sub-octave generators (one octave down and two octaves down) per voice
Feedback loop per voice with programmable level and gain
Four assignable performance controls per program
Gated 16 x 4 step sequencer (one sequence per program)
Fully programmable (free downloadable software editor for Mac OS and Windows)
512 programs organized into four banks of 128; 128 combos
I/O: USB 2.0 (type B receptacle), MIDI In, MIDI Out/Thru, Poly Chain Out, Audio Outs 1/Left, 2/Right, 3, and 4 (1/4″ unbalanced), 1/4″ Headphone Out
7.9ﾔ L x 5ﾔ W x 2.7ﾔ H (20.07 cm x 12.7 cm x 6.86 cm)
1.8 lb. (0.81 kg)
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.