Sequence Parameters. Dave Smith Instruments TETR4

external clock source, Tetra must be receiving MIDI clock messages in order for the arpeggiator to run.

The tempo and note value are determined by the Clock Parameters.

Mode: see table — Sets the order in which the arpeggiator plays notes.

Display Arpeggiator mode

Up

Down

Up Down

Arpeggiated notes play in ascending order.

Arpeggiated notes play in descending order.

Arpeggiated notes play in alternately ascending and descending order.

Assign Arpeggiated notes play in the order in which they were struck.

On/Off: Off, On — Turns the arpeggiator on and off. Turning it on will turn off the Sequencer if it is on.

Sequence Parameters

Tetra features a 4 x 16 “analog-style” step sequencer that can generate four separate sequence tracks of up to 16 steps each. Each of the 4 voices has its own sequencer. Individual sequencer tracks can be routed to any standard modulation destination (see the table on page 35). Using VCA Envelope as a destination, for example, varies the volume of each step; a destination of Filter or Filter

Envelope Amount will produce different filter settings per step. Typically, however, at least one sequence is routed to an oscillator to control pitch.

The sequencer is a “gated” sequencer. That is, a note must be played, either from the P

USH

I

T

switch or via MIDI, in order for the sequence to be heard and it will continue to play as long as the note is held (gated) .

Note: The P USH I T switch’s Toggle parameter enables notes (and, therefore, sequences) to be latched on for sustained playback.

The Clock Parameters determine the note value/tempo of the sequencer. The actual gate duration for each step is fixed at half the step time. Use the envelopes to generate notes of longer or shorter duration.

One very useful way to modulate a parameter in sync with a sequence is using

LFOs with sync; LFO frequency runs from 0 to 150, after which you can select the sync settings. A setting of 16 Steps for LFO Frequency with a Triangle wave selected and routed to the filter will provide a clean filter sweep over a 16 step sequence, perfectly in sync! This is much easier (and smoother) than programming a filter sweep using sequence steps.

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