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MIDI Sequencer for the TETRA

(11 Votes)
2.0 (Updated 10 years ago)
October 13, 2010
Reaktor 5 or lower
Instrument Sequencer


TetraSeq is a sequencer for Dave Smith's analog hardware synthesizer TETRA. It should also work with Dave Smith's Mopho, except that the Mopho has only one voice. Chances are it also works with Dave Smith's Prophet 08.

- 4 main sequencers with 5 sequence tables each
- Individually variable length of sequence tables (max 16 steps)
- Adjustable global Shuffle amount
- Predefined controllers (CC and NRPN)
- Sequencer data can be shifted back and forth
- Copy and paste of sequencer data
- Additional controls include Tune, Gate duration, Gate threshold, Envelope Sustain, and Oscillator glide
- Convenient control of Master Tune, Multi-mode and Audio Out
- Individually enable/disable subsequencers and select MIDI channel, program and bank
- Sequencer data is stored within snapshots
- Scale mapper for pitch sequencer data
- Prelisten entered notes
- Rescale sequencer table

- Updates:
- Added a "Scale Mapper" for applying scale maps to the pitch sequencer
- Added "prelisten" and pitch display to aid entering of notes
- Added rescale fader to each sequencer table
- Added a "panic" button to kill hanging notes
- Added "Init All" to inititalize the whole sequencer

- Fixed: Inexact readout of mouse position for certain sequence lengths.
- Changed: "Gate Duration" as target instead of "Gate Length", and correspondingly "Dur" instead of "Hold" at the controller knob.


- Enable Info View to get help for individual panel elements.

- Remember to first select one of the 4 main sequencers

- Right-click or right-drag in a sequence table to set zero values.

- The sequencer data is stored within the snapshots, so you can freely edit them without overwriting sequencer data across snapshots. If you create a snapshot for each sequence pattern to be used in a song, you can then select the sequence patterns from within the host sequencer by using MIDI Program Change commands.

- You can copy and paste sequencer data across snapshots easily using the global buffers in the top right corner.

- Only the visible data in the sequence table is shifted, copied or pasted. Thus, by varying the length of the sequence table, you can shift, copy or paste parts of the sequence.

2010 by Kim Bostroem


Jason Jensen
8 years ago
Any help on how I can get this set up to control my Tetra in Ableton Live? This is exactly what I've been looking for but I cant seem to get it to talk to my synth for the life of me. Thanks in advance.
Kim Joris Boström
10 years ago
Hi Tasos, thanks for your feedback! I'm happy that TetraSeq also works with the MoPho. I'm not quite sure if I understand the problem with the display. Why is it cumbersome if the Mopho displays the received messages? Does it slow down the response? Maybe you have put the Mopho into edit mode? The tetra does only display messages when in edit mode. Anyway, can't you just ignore the displayed messages? Greetz, Kim
Tasos Karadedos
10 years ago
Hi Kim just wanted to report that this works fine with the Mopho. Only drawback is that on the Mopho itself the display keeps putting out the received messages, making knob tweaking cumbersome. Not sure how to go around this. thanks for a useful ensemble!