Alchemy source subpage controls 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/D button to select the source you want to edit.

Each of the four sources has an identical set of controls for more in-depth editing. Several source subpage controls are duplicates of those found in the source master controls. See Alchemy source master controls in Logic Pro for Mac.

For information on source filter controls, see Alchemy source filters in Logic Pro for Mac.

Figure. Source sub-page, showing all parameters.

The waveform display and element controls section update to show relevant data and parameters when different synthesis engines are active. The additive element is active for source A in the image.

Source subpage controls

On/off button: Turn the source on or off.
Source select pop-up menu and field: Displays the name of the current source audio data. Click to open a pop-up menu with source content handling commands. See Alchemy source master controls in Logic Pro for Mac.
Solo button: Isolate the source by turning off all other sources. Click again to restore the on/off status of other sources.
Note: If you save a preset with one source in solo mode, the resulting preset retains the on state of the source, but solo mode is disabled. All other sources are off.
Stereo button: Turn stereo mode on or off. If stereo mode is off and a stereo file is loaded or imported, only the left channel is played. When stereo mode is on, loaded or imported sounds are played in stereo. This makes it possible to pan individual oscillators in the additive element or individual grains in the granular element, for example.
Edit button: Open the source edit window. See Alchemy source edit window in Logic Pro for Mac.
Volume knob: Set the source output level (-inf dB to 0 dB).
Wait knob: Set a delay between the keystrike and triggering of the source.
Coarse Tune knob: Tune the source pitch in semitone increments.
Fine Tune knob: Tune the source pitch in increments of one cent (one hundredth of a semitone).
Position knob: Determine the playback start position in the audio data. A value of 0% indicates the absolute start point of the audio data. A value of 100% indicates the absolute end point. See Alchemy source modulations in Logic Pro for Mac.
When the Loop Mode pop-up menu and field (see entry below) is set to Start/End or Start/Length, the Position (and Speed) knob is replaced with the following two controls:
- (Loop) Start knob: Determine the playback start position in the audio data. A value of 0% indicates the absolute start point of the audio data. A value of 100% indicates the absolute end point.
- (Loop) End/Length knob: Loop End sets the playback end point. Loop Length determines the playback length, expressed as a percentage of the overall length of the sample.
Speed knob: Set the audio data playback rate in additive, spectral, or granular mode. Speed has no effect when the element is set to sampler mode. A setting of 100% represents the original playback rate. Higher settings (up to 500%) represent faster playback, while lower settings (down to 0%) represent slower playback.
Playback begins at the point set with the Position knob and travels through the audio data on a path determined by the Loop mode. Speed determines the rate of this travel. Playback remains at the normal pitch regardless of the rate of travel. Set Speed to 0% to halt playback at the point set with the Position knob.
Sample Tempo field: Displays the analyzed sample tempo of imported audio material. You can set it to Off or a value between 5 and 990 to match the length of beats in the audio file with beats in the project. The file tempo is automatically analyzed for tempo (BPM) info on import.
Note: When Sample Tempo is set to any value other than Off, the speed of sample playback is a multiple of the project tempo (BPM) and the analyzed audio file BPM. This results in a beat in the audio file matching the playback time of a beat in the project, when the Speed parameter is set to a value of 100%.
Keyscale pop-up menu and field: Choose from three key scaling options that affect source pitch response to incoming MIDI data.
- Key+PBend: The pitch of the source responds to MIDI note and pitchbend data.
- Key: The pitch of the source responds to MIDI note data but does not respond to pitchbend data.
- Off: The pitch of the source does not respond to either MIDI note or pitchbend data.
  Note: Global pitchbend behavior is determined with the PitchBend Up and Down controls in the master voice section. See Alchemy master voice section in Logic Pro for Mac.
Loop Mode pop-up menu and field: Choose from five loop mode options that affect playback of the source audio data.
- None: Ignores the loop start and end points, and plays the entire sound once without looping.
- Continuous: Plays from the beginning, enters the loop region, and loops continuously in a forward direction while a note is held and during the envelope release phase.
- Sustain: Plays from the beginning, enters the loop region, loops continuously while a note is held, and exits the loop region to play the normal sound release phase.
- Forward/Back: Like Continuous, but plays the loop region alternately forward and backward.
- Start/End: In this mode, playback starts from the defined start point, playing at 100% speed to the defined loop end position, then skips to the start point and repeats. These positions are set with the Loop Start and Loop End knobs (see entries above).
  Note off messages have no impact on loop repetitions. If the loop end point is placed before the loop start point, playback is reversed (backwards to the loop end point) when the loop start point is reached.
- Start/Length: In this mode, playback starts from the defined start point, playing at 100% speed to the defined loop end position, then skips to the start point and repeats. The length of the loop, controlled with the Loop Length knob, is set as a percentage of the overall length of the sound, such that loop end point is equal to the loop start point plus loop length.
  If the settings of Loop Start and Loop Length controls (see entries above) cause playback to go beyond the end of the underlying sample, silence is automatically inserted at the end of the sound.
- All: Ignores the loop start and end points, and loops the entire sound continuously.
  Note: The loop start and the loop end points, and sample start and end points, can be edited in the Main edit window. See Alchemy source edit window in Logic Pro for Mac and Alchemy zone waveform editor in Logic Pro for Mac. The VA noise component is not affected by the Loop mode setting.
Waveform overview display: Shows the waveform for the source when the granular or sampler element button is active. The display also shows real-time additive or spectral data, or a representation of the waveform, if the Position or Speed controls are selected. When Position is adjusted, a position indicator is shown, allowing you to fine-tune the start position.
Synthesis element buttons: Choose the synthesis type, and view and change related parameters in the area below. A variable combination of the Additive, Spectral, Pitch, Formant, Granular, Sampler, and VA buttons is available for use, depending on the audio data specified in the source select field and the import method used, if applicable. See Alchemy source elements overview in Logic Pro for Mac and Alchemy Import browser 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 subpage controls in Logic Pro for Mac

Source subpage controls