Generates a single envelope stage.

Booster Stage features all of Stage’s functionality, enhanced by CV inputs, S curves, buttons to inject triggers and other control signals, and more.

Combine Stage, Booster Stage, Hostage, and Upstage modules to generate complex envelopes with any number of stages.

See also:

• Generating Single-Stage Envelopes
• Generating Multi-Stage Envelopes
• How Stages Work Together
• J and S Curves

Controls

• LEVEL: The voltage level at which each generated envelope stage ends.

  The polarity switch (UNI / BI) selects the range of the LEVEL knob: Either unipolar control voltage (0 to 10V) or bipolar control voltage (-5 to 5V).

• CURVE: The curvature of the envelope stage. The shape switch (S / J) selects the shape of the envelope stage.

• DURATION: The duration of the envelope stage.

  The duration switch (1 / 10 / 100) sets the range of the DURATION knob. The switch labels indicate the maximum duration (seconds) for each range. For each range:

  • The minimum duration is 1/1000 of the maximum: 1ms, 10ms, or 100ms.
  • Centering the knob gives a duration of 1/10 of the maximum: 100ms, 1s, or 10s.

• Buttons: The DEFER and TRIG inputs and the ACTIVE and EOC outputs each have an associated “manual override” button. While pressed, each button injects 10V into the associated signal (unless the signal exceeds 10V).

Ports

• DEFER: When the DEFER gate signal is high, Booster Stage defers to its IN signal, forwarding the IN signal directly to the OUT output.

  When it begins deferring, Booster Stage abandons any envelope stage it may have been generating.

• TRIG: When triggered, Booster Stage generates an envelope stage, starting at the voltage sampled from the IN signal.

  While Booster Stage is deferring, it ignores incoming triggers.

• IN: When Booster Stage generates an envelope stage, the stage starts at the voltage sampled from the IN signal.

  While Booster Stage is deferring, it forwards the IN signal directly to its OUT output.

• ACTIVE: A 10V gate signal indicating that Booster Stage is either actively generating an envelope stage or deferring to its IN signal.

• EOC: When Booster Stage completes an envelope stage, it emits a 1 millisecond 10V pulse at its EOC output.

• OUT: The generated envelope stage signal or (when deferring) the IN signal.

• CV: A control voltage signal to modulate the associated parameter.

Notes

• While an envelope stage is in progress, all of the knobs are “live.” If you adjust a knob, Booster Stage applies the new value to the remainder of the stage.

• Before Booster Stage first becomes active (by either a trigger or a DEFER gate), it “tracks” its input by sending its IN voltage to its OUT port. Stage also enters this mode when its DEFER gate falls (unless the TRIG port is high).

• After Booster Stage completes an envelope stage, it “tracks” the LEVEL knob by sending the LEVEL voltage to the OUT port.

State Model

TrackingInput Mode

Booster Stage starts in TrackingInput mode. While Booster Stage is TrackingInput:

• it is inactive
• it “tracks” its input by sending its IN voltage to its OUT port
• if DEFER rises, Booster Stage enters Deferring mode
• if TRIG rises, Booster Stage enters Generating mode

Deferring Mode

Whatever mode Booster Stage is in, whenever its DEFER gate rises, it enters Deferring mode. While Booster Stage is _Deferring:

• it is active
• it sends its IN voltage to its OUT port
• it ignores its TRIG port

When the DEFER gate falls, Booster Stage resumes TrackingInput.

Generating Mode

If the TRIG port rises while Booster Stage is not Deferring, it begins Generating a stage. While Booster Stage is Generating:

• it is active
• it advances its phase and generates the appropriate voltage at its OUT port
• if the stage completes, Booster Stage initiates a short pulse on its EOC port and enters TrackingLevel mode
• if DEFER rises, Booster Stage enters Deferring mode
• if TRIG rises, Booster Stage abandons the stage it is generating and begins a new one

TrackingLevel Mode

While Booster Stage is TrackingLevel:

• it is inactive
• it sends the voltage of its LEVEL knob to its OUT port
• if DEFER rises, Booster Stage enters Deferring mode
• if TRIG rises, Booster Stage enters Generating mode