Program Parameters. Sequential TETR4, Tetra

Program Parameters

All Program parameters can be edited using any of A SSIGNABLE P ARAMETERS controls. To assign a parameter to a control, press the A SSIGN P ARAMETERS button to light the LED, and then turn any of the knobs (1 through 4) to select a parameter. A full list of the parameters can be found on page 44. The selected parameter and value appear in the LCD display. The top line of the LCD displays the programmed value for reference; the bottom line displays the edited value.

To then change the value of the parameter you selected, hit the A SSIGN

P ARAMETERS button again, and the same knob will now change the value. You can also use the increment and decrement switches to adjust parameter values.

Note: Once you are done editing a program, before you save it, you should consider what parameters you want to access when playing the new program. Generally, when making a program, we try to assign each of the 4 knobs to a different parameter that makes sense for that particular program, providing extra live control.

Though it is certainly possible to perform detailed program generation and editing using these controls, it is usually much faster to use the free editor available for Mac OS or Windows. The minimal front panel of the Tetra is designed for fast, real-time changes in live performance.

Following are descriptions of each Tetra Program parameter.

Oscillator Parameters

Tetra has two analog oscillators per voice. The basic controls for each oscillator are the same.

Note: There are additional modulation controls that can affect the pitch of Oscillators 1 and 2. These are covered in other sections of the

Parameter definitions.

Osc Freq: C 0…C 10 — Sets the base oscillator frequency over a 10 octave range, from 8 Hz to 8KHz, stepping in semitones. C3 is middle C, the first octave is 0 (C0, C#0, etc.), the second octave is 1 (C1, C#1, etc.), and so on.

Fine Freq: -50…+50 — Fine Tune control; 0 centered. Steps in cents (50 cents =

1/2 semitone).

Shape: see table — Selects the oscillator waveshape as follows:

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