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Surround Panner parameters in Logic Pro

In Logic Pro, the Surround Panner features a set of common parameters, regardless of the channel strip input format.

Figure. Mono to Surround Panner window.

Common Surround Panner parameters

  • Surround Field parameters: The surround field consists of the following:

    • Four real-time display fields, for angle, diversity, elevation, and spread (stereo only). You can directly interact with these fields by dragging the pucks.

    • A circular grid, comprising four concentric circles, divided into eight 45-degree segments. The outer circle represents the minimum amount of diversity. The center circle represents maximum diversity.

    • A further circle encloses the grid. This is the diversity and angle display. As you change the diversity or angle, a portion of the display is highlighted.

    • When the separation controls are on, a square is overlaid on the grid. This indicates the separation point between left and right channels, and also front and rear (surround) channels. Drag the corners or edges of this separation square or use the sliders in the lower section of the Surround Panner window to change values.

    • A number of speaker icons surround the circular grid. Blue speakers represent surround channels and green speakers represent overhead channels. Click the speakers to turn the respective channels on or off, thus changing the channel surround output format.

    • Drag the pan puck to control signal routing (surround position in relation to the speaker outputs). You can modify movement of the blue dot with these functions:

      • Press and hold Command to lock diversity.

      • Press and hold Option-Command to lock the angle.

      • Option-click the green puck to reset angle and diversity.

  • Separation Controls parameters: When the separation controls are on, the separation square is overlaid on the grid. Change the values of the parameters to determine the amount of separation between channels. As you change these parameters away from values of 1.00, the separation square changes (to a trapezoid or rectangle) in the surround field, providing a visual representation of how changes in these values affect the channel. The separation controls are not available when you use a surround format with overhead channels.

    • Separation XF: Applies to the Left and Right (front) channels. Reducing Separation from 1.00 down to 0.00 mixes the right signal into the left channel, and vice versa, until both channels output a mono signal.

    • Separation XR: Applies to the Left and Right Surround (rear) channels. Reducing Separation from 1.00 down to 0.00 mixes the right signal into the left channel, and vice versa, until both channels output a mono signal.

    • Separation Y: Affects the mix relationship of the front and rear channels (in front of or behind the listening position, in other words). It mixes the Left/Left Surround and Right/Right Surround channels. When Separation Y is set to 0.00, the front and rear channels output in mono.

      You can edit the separation controls graphically by dragging the edges and corners of the separation square. You can Option-click the value field for each parameter to reset them to default values.

      Note: In 7.1 ITU surround formats, the separation of Left Middle and Right Middle is determined by the average separation value of the front and rear channels.

  • Planar or Spherical mode: When using a surround format with overhead channels, this mode lets you take advantage of the added dimension of height and choose the virtual shape of the panning plane.

    • Planar: Panning results are placed on a flat circular plane.

    • Spherical: Panning results are placed on the edge of a virtual sphere.

  • Center Level slider: Drag the Center Level slider or field to set the volume relationship of the (front) center channel—typically used for dialogue in film and TV productions.

  • LFE Level slider: Drag the LFE Level slider or field to control the volume of the LFE output. The abbreviation stands for Low Frequency Enhancement or Low Frequency Effects, as the LFE output is most commonly sent to a subwoofer channel. The use of a subwoofer speaker is not mandatory.

    Tip: If you want only low frequency signals to reach the output, insert a multi-mono surround EQ into the surround master channel strip. Use this to set the LFE (or subwoofer) output. A cutoff frequency of 120 Hz is standard for most surround apps. For more information, see Surround master channel strip in Logic Pro.

  • Level Compensation pop-up menu: Select the surround pan law for stereo-to-surround and mono-to-surround channels.

    Note: These options appear only in projects that were mixed in surround and saved in Logic Pro versions 8.x to 9.1.6.

    • Unity gain at speaker: The default setting for mono-to-surround and stereo-to-surround channels. All new projects and projects imported from Logic Pro 9.1.7 or later follow this pan law.

      A mono signal panned hard left of a stereo output with X dB gain will do the same if panned hard left with a mono-to-surround panner. A stereo signal panned hard left and right with X dB gain will do the same if panned hard left and right with a stereo-to-surround panner.

    • Unity gain at mid-point: This was the default setting used for Logic Pro versions 9.1.4 to 9.1.6. Projects imported from these Logic Pro versions will adopt the Legacy pan law. You can choose a different pan law from a dialog or this pop-up menu.

    • Legacy (Pre Logic 9.1.4): This was the default setting used for Logic Pro versions 8.x to 9.1.3. Projects imported from these Logic Pro versions will adopt the Legacy pan law. You can choose a different pan law from a dialog or this pop-up menu.

Download the guides:

Logic Pro User Guide: Apple Books | PDF

Logic Pro Instruments: Apple Books | PDF

Logic Pro Effects: Apple Books | PDF

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