Alchemy source filters in Logic Pro for Mac

Source components are shown only in advanced view. Click the Advanced button to switch to advanced view, then click the A, B, C, or D button to select the source you want to edit.

The source filter module provides three multimode filters, which can be configured either in series or in parallel. The source filters let you filter each source independently. The main filters, by comparison, process a mix of all four sources. See Alchemy main filter controls in Logic Pro for Mac.

Tip: Though you can use filters at multiple locations in the signal path, you can attain identical or similar results by careful use of fewer filters, which helps to reduce CPU load.

When the source filters are configured in series, the signal passes through the three filters, one after the other.
When the source filters are configured in parallel, the signal is split and fed through the three filters simultaneously.

Source filter parameters

The most common filter controls are listed. Note that the chosen filter type can change both the name and function of available controls, notably the Cutoff, Resonance, and Drive parameters. See Alchemy filter types in Logic Pro for Mac and Alchemy source filter use tips in Logic Pro for Mac.

1/2/3 buttons: Select each filter. The three filters are independent and can have unique settings. The LED at the top of each button shows on (lit) or off (unlit) status.
On/Off buttons: Turn each filter (1, 2, or 3) on or off.
Filter type pop-up menu: Choose the filter. Use the descriptive names Clean, Edgy, Gritty, Rich, Sharp, Smooth or another filter type, such as Formant or Bitcrusher. You can step through all available filter types with the Previous and Next buttons (the arrows).
Ser/Par buttons: Set the filter routing configuration. Series runs from the first filter into the second filter into the third filter. Parallel runs the three filters side by side.
Cutoff knob: Set the cutoff frequency for the chosen filter type.
Resonance knob: Boost or cut frequencies above, below, or surrounding the value set with the Cutoff knob. Resonance behavior changes when different filter types are chosen.
Drive knob: Overdrive the filter. This can lead to intense distortions and aliasing, depending on filter type.
Send knob: Set the level of the knob(post source filters, if used) sent to the destinations specified with the Send pop-up menu.
Send pop-up menu: Determine where the source output is source filters, if used.
- F1/F2: Source output is routed to main filters (1 and 2). The balance between these targets is set with the Send knob.
- F1/FX A/B/C/D: Source output is routed to main filter (1) and effects rack A, B, C, or D. The balance between these targets is set with the Send knob.
- F2/FX A/B/C/D: Source output is routed to main filter (2) and effects rack A, B, C, or D. The balance between these targets is set with the Send knob.
  Note: Signal effects rack A, B, C, or D destinations bypass the main filters when the Send knob is set to the full right position. See Alchemy effects overview in Logic Pro for Mac.

Download the guides:

Logic Pro User Guide: PDF

Logic Pro Instruments: PDF

Logic Pro Effects: PDF

Control Surfaces Support Guide: PDF

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Logic Pro User Guide for Mac

Alchemy source filters in Logic Pro for Mac

Source filter parameters