Sculpture envelope overview in Logic Pro for iPad

Sculpture control sources include two envelopes. In traditional synthesizer designs, envelopes are used to control amplitude and filter levels over time. By comparison, Sculpture envelopes are somewhat special in that they can be used as:

Traditional four-segment envelopes.
MIDI controller modulations.
A combination of both—as MIDI controller movement recorders with ADSR-like macro parameters, for polyphonic playback.

Control Envelope Mode parameters

The two Control Envelope sections provide two targets, for a total of four controllable parameters when both envelopes are fully utilized.

Ctrl/Env buttons: Select either controller (run mode) or standard envelope behavior. If both buttons are turned on, the controller value is added to the envelope output, resulting in a modulation offset.
Note: When the envelopes are used as polyphonic modulation recorders and playback units, each voice is handled independently, with a separate envelope being triggered as each note is played.
Record Enable button: Start or stop envelope recording. Recording can also be stopped using the trigger mode function described below.
Record Trigger pop-up menu: Choose different record trigger modes to start and stop recording when the Record Enable button is active.
- NoteOn: Recording starts when a note is played.
- Note + Ctrl Movement: Recording starts when MIDI control change messages arrive while a note is held (for information about assigned MIDI controllers, see Define Sculpture MIDI controllers.
- Note + Sustain Pedal: Recording starts when the sustain pedal is depressed while a note is held.

Control Envelope Target and Source parameters

Target 1/2 Enable buttons: Turn the control envelope 1 and 2 modulation sources on or off.
Amount and Via Amount knobs: Set the modulation amount. In cases where any via source other than “Off” is selected, both knobs are available for use.
- Amount knob: Set the modulation amount when the incoming via signal is 0, such as when the modulation wheel is at its minimum position, for example.
- Via Amount knob: Set the modulation amount when the incoming via signal is at full level, such as when the modulation wheel is at its maximum position, for example.
Target 1/2 pop-up menus: Choose modulation targets 1 and 2. Two targets can be assigned per envelope, with an optional via modulation.
Via 1/2 pop-up menus: Choose the modulation source used to scale the amount of envelope modulation. Source options include Off, Velocity Concave, Velocity, Velocity Convex, KeyScale, Ctrl A, and Ctrl B.

Control Envelope Level, Time, and Curve parameters

The following parameters are active only if the envelope is engaged (either the Env or both the Ctrl and Env buttons are active).

The maximum time/length of the envelope is 48 bars/40 seconds.

You can create your own envelopes manually by manipulating the Level slider and Time knob values, or you can record an envelope, as discussed in Record Sculpture envelopes.

TimeScale knob: Scale the duration of the entire envelope between 10% (ten times faster) and 1000% (ten times slower). This also affects the appearance of the envelope curve displayed as it is shortened (sped up) or lengthened (slowed down).
Attack Velosens knob: Set velocity sensitivity for the attack phase of the envelope. Positive values reduce the attack time at lower velocities. Negative values reduce the attack time at higher velocities.
Time Mode buttons: Select either a free-running envelope (Free) or a tempo-synced (Sync) envelope with note value options, such as 1/8 or 1/4.
Note: Switching between values forces a recalculation of times to the nearest note value or ms time, respectively, based on the current project tempo.
Level 0-4 sliders: When an envelope is first engaged, a default envelope curve is automatically created, containing several control points and segments. You can use the Level sliders to set the amount of each envelope segment. Each segment has a corresponding time control, except the Start segment (Level 0 slider), which is always positioned at the envelope start point.
- Level 0 slider: Set the envelope Start value.
- Level 1 slider: Set the envelope Attack value.
- Level 2 slider: Set the envelope Loop value.
- Level 3 slider: Set the envelope Sustain value.
- Level 4 slider: Set the envelope End value.
Time 1-4 knobs: Set the duration of each envelope segment. As you change values, the overall length of the envelope changes—with all following control point times and segments being moved.
Note: You cannot move a control point beyond the position of the preceding control point. You can, however, move control points beyond the position of the following one—effectively lengthening both the envelope segment and the overall envelope.
- Time 1 knob: Set the envelope Attack time.
- Time 2 knob: Set the envelope Loop time position.
- Time 3 knob: Set the envelope Sustain time position.
- Time 4 knob: Set the envelope End time position.
Curve 1-4 fields: Drag vertically to create a curved shape between envelope control points for the corresponding segment, rather than straight lines.

Control Envelope Loop and Sustain parameters

Sustain Point knob: Set one of the envelope control points as the sustain point.
Loop Point knob: Set one of the envelope control points as the loop point.
Sustain Mode pop-up menu: Choose the behavior of the envelope while a note is held. Choices are Sustain mode (default), Finish mode, and three loop modes—Loop Forward, Loop Backward, and Loop Alternate. See Loop Sculpture envelopes.

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Logic Pro User Guide for iPad

Sculpture envelope overview in Logic Pro for iPad

Control Envelope Mode parameters

Control Envelope Target and Source parameters

Control Envelope Level, Time, and Curve parameters

Control Envelope Loop and Sustain parameters