Alchemy reverb effects in Logic Pro

Effect modules are shown only in browse or advanced view. Click the Browse or Advanced button to switch to either view, then click the Effect button in the Perform/Arp/Effects section.

Effects in this group are used to add ambience to the signal.

Alchemy Acoustic Reverb effect parameters

High quality, full-featured reverb effect.

Time knob: Set the length of the reverb tail. Values up to 20 sec are possible.
Pre Delay knob: Set the amount of initial delay before diffuse reflections begin.
Size knob: Determine the dimensions of the simulated space.
Width knob: Determine how much reflections are spread across the stereo field.
Diffusion knob: Determine the density of the early reflections.
Gate knob: Set a threshold below which the reverb tail is gated. Attack shapes the beginning of the gated tail, while Decay shapes its end.
Attack knob: Attack shapes the beginning of the gated reverb tail.
Decay knob: Decay shapes the end of the gated reverb tail.
EQ knobs: Modify the frequency content of the wet signal. LoFreq sets the frequency of a low shelf that you can boost or cut with LoGain. HiFreq sets the frequency of a high shelf that you can boost or cut with HiGain.
Damping knobs: Determine the amount of frequency-specific losses (damping). DampLoF sets the frequency of a low shelf that you can damp by increasing DampLoAmt. DampHiF sets the frequency of a high shelf that you can damp by increasingDampHiAmt.
Variation knob: Determine the reverb color.
Quality knob: Determine the processing precision. Use low values to conserve CPU resources.
Mix knob: Set the wet/dry balance (0% = dry only; 50% = equal mix; 100% = wet only).
File button: Open a pop-up menu with several useful commands and to access presets.
- Presets: Choose a preset from the submenu.
- Save: Open a dialog where you can name and save the current settings to a new preset. The saved preset name is shown at the bottom of the Presets submenu list.
- Copy/Paste: Copy the current settings to the Clipboard and paste the Clipboard contents.
- Clear: Reset all parameter settings to default values.

Alchemy Classic Reverb effect parameters

CPU-efficient reverb.

File button: Open a pop-up menu with several useful commands and to access presets.
- Presets: Choose a preset from the submenu.
- Save: Open a dialog where you can name and save the current settings to a new preset. The saved preset name is shown at the bottom of the Presets submenu list.
- Copy/Paste: Copy the current settings to the Clipboard and paste the Clipboard contents.
- Clear: Reset all parameter settings to default values.
Pre Delay knob: Set the amount of initial delay before diffuse reflections begin.
Damping knob: Determine the amount of high frequency loss in the reflections.
Hi/Lo Cut knobs: Set high and low frequencies. The wet signal above and below is cut.
Size knob: Determine the dimensions of the simulated space. Larger values equal longer reverb times.
Mix knob: Determine the wet/dry balance (0% = dry only; 50% = equal mix; 100% = wet only).

Alchemy Convolution Reverb effect parameters

A high-quality reverb effect that uses recordings of actual acoustic spaces, such as caves, tunnels, halls, and so on. These recordings are known as impulse responses. You can apply an impulse response to your Alchemy preset which makes it sound like it is being played in the chosen acoustic space.

Dry knob: Set the level of the dry signal sent to the main outputs.
Wet knob: Set the level of the effect signal sent to the main outputs.
PreDelay knob: Set the amount of initial delay before diffuse reflections begin.
Size knob: Determine the dimensions of the simulated space. Larger values equal longer reverb times.
Stereo knob: Set the output width of the convolution. When set to 100%, the output width is dictated by the impulse response sample. When set to 0%, it is equivalent to convolving with a mono version of the stereo impulse.
Start knob: Determine the start point of the loaded impulse response.
End knob: Determine the end point of the loaded impulse response.
Tip: Where possible, try to use the shortest possible impulse response length required because this helps to reduce CPU load. If you change the IR length, you will need to adjust the envelope shown in the Impulse response display.
Impulse response display: View the loaded impulse response waveform. An editable level envelope is superimposed over the waveform.
- Drag the envelope points to set levels over the duration of the impulse response.
- Click on or near the envelope line to create new points.
- Double-click a point to delete it.
IR pop-up menu and field: Load an impulse response (IR). Use the arrows to step forward and backward through impulse responses.
File button: Open a pop-up menu with several useful commands and to access presets.
- Presets: Choose a preset from the submenu.
- Save: Open a dialog where you can name and save the current settings to a new preset. The saved preset name is shown at the bottom of the Presets submenu list.
- Copy/Paste: Copy the current settings to the Clipboard and paste the Clipboard contents.
- Clear: Reset all parameter settings to default values.
  Note: The impulse response file is not loaded, saved, or copied and pasted. File menu commands affect only the parameter settings.
Reverse button: Reverse playback of the loaded impulse response.
On/off buttons: Enable or disable either integrated filter module.
Filter type pop-up menus and fields: Choose the filter type. See Alchemy filter types in Logic Pro.
Cutoff knobs: Set the cutoff frequency for each filter.
Resonance knobs: Set the resonance or emphasis for each filter. Higher settings boost frequencies in the immediate vicinity of the cutoff frequency.

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