Dual Sequential Switch
Preorders Open

Bidirectional sequential switches for audio and CV

ETA is Q1 2023

The standard build has audio I/O jacks on the top and banana I/O jacks on the bottom. Custom builds with all audio or all banana jacks can be supplied, please send an email with your preference after placing your preorder. Custom builds are available on a limited basis for preorders only.

The DSS is intended as a companion for the Buchla 245/246 sequencers or other "quad" modules in Buchla format such as the 281 and 292. New possibilities for performance and composition arise from the ability to dynamically switch between multiple sources and destinations.

The main I/O is bidirectional, meaning that the module works as a 4:1 multiplexer or a 1:4 demultiplexer. Patch up to four signals to the inputs labeled 1-4 and they will be sequentially routed to the common I/O jack. Alternately, patch one signal source to the I/O jack and it will be sequentially distributed to the 1-4 jacks.

Each half of the module has its own independent sequence length (from 1 to 4 steps) and sequencing mode (forwards, backwards, forwards and then backwards (pendulum), or random). The SC output (Step Change) generates a trigger whenever the sequence length is changed, which is useful for synchronizing the upper and lower halves of the module or communicating state changes to other modules. The analog CV addressing input (ADDR) bypasses pulse-based control and allows an external CV source to select which step is active, similar to the "analog" CV input on the Buchla 245/246.

These extensive control and sequencing options make the DSS one of the most fully-featured sequential switches available in any modular format.

Tech Specs

  • 4:1 or 1:4 sequential switches for audio or CV
  • Variable sequence length (1-4 steps)
  • VC stage addressing via clock, direct selection, or external 0-10V CV
  • Variable switching mode (forward, reverse, pendulum, random)
  • Extensive pulse I/O for synchronization with external modules

Extra Credit

The DSS has three hidden features which are not immediately obvious.

RESET/TRIG switch toggle. By default, pressing the RESET switch returns the sequencer to step 1, but the function of this switch can be changed to a manual trigger switch instead. Press RESET for 5 seconds to toggle this setting. The SC LED will blink to confirm the change. Now when the RESET switch is pressed, the TRIG jack will be pulsed instead and the sequencer will not reset to step 1 unless the RESET jack receives a pulse. Press RESET again for 5 seconds to toggle its function back to a manual reset.

Manual step selection. Press the RESET switch and then turn the STEPS knob for manual step addressing. This simulates the function of the ADDR CV input but does not require external CV. Note that all trigger inputs (RESET, TRIG, and the four SELECT jacks) will still be operational, so this feature works best when those inputs are not being used.

Pendulum behavior. Press the RESET switch and then point the MODE knob towards one of the four zones to change how the Pendulum mode behaves.

Pendulum Mode Description
Repeat None (F) The loop cycles forwards and backwards with no repeated steps.
Repeat First (B) The first step is repeated twice per loop.
Repeat Last (B) The last step (as defined by the STEPS knob) repeats twice per loop.
Repeat Both (R) Both the first and last steps are repeated twice per loop.

When the Steps knob is pointing to a number greater than 1, the various Pendulum settings allow for unusual time signatures and polyrhythms, particularly when the top and bottom halves of the module are used together.

Steps Knob Value Pendulum Mode Step Repeats Base Loop Length Final Loop Length
2 Repeat None (F) 0 2 2
Repeat First (B) 1 2 3
Repeat Last (P) 1 2 3
Repeat Both (R) 2 2 4
3 Repeat None (F) 0 4 4
Repeat First (B) 1 4 5
Repeat Last (P) 1 4 5
Repeat Both (R) 2 4 6
4 Repeat None (F) 0 6 6
Repeat First (B) 1 6 7
Repeat Last (P) 1 6 7
Repeat Both (R) 2 6 8