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Alchemy extended parameters in Logic Pro for iPad

Alchemy provides additional parameters that set the overall output quality and change the way Alchemy responds to incoming MIDI note information.

Extended parameters

Tap the More menu to access Mono Mode parameters outlined in this section.

  • High Quality button: Choose the processing resolution on output. This setting remains active when loading other presets or when recalling the project.

  • Polyphony pop-up menu and field: Set the number of playback voices, up to the maximum possible polyphony value. Customized entry is a dimmed read-only value that is selected when an imported Logic Pro for Mac project contains the Alchemy plug-in which has different Polyphony values for individual sources (A/B/C/D).

    If you choose Legato, and play in a legato style (strike a new key while holding another) the envelope generators are triggered only for the first note you play legato, and continue their curve until you release the last legato played key. If you release each key before pressing a new one, the envelope is not triggered by the new note. Legato restricts polyphony to one voice.

    If you choose Mono, the envelope generators are re-triggered every time you play a new note, even in a legato style. Mono restricts polyphony to one voice.

  • Key Trigger pop-up menu and field: Choose Off, On, Snap to Rate, Snap to Division, or Customized.

    The arpeggiator is active if the arpeggiator mode in the loaded preset is in any state other than off, or if it is modulated.

    If the arpeggiator is not in All mode in the loaded preset, and more than one of the A/B/C/D arpeggiators is turned on, the Customized option is shown.

    Choose Customized to recall the original key trigger states of the preset. Choose any other option, except Off, to set arpeggiator Key Trigger values for all arpeggiators.

  • MIDI Mono Mode pop-up menu: Choose Off, On (Base Channel 1), or On (Base Channel 16).

    In either mode, each voice receives on a different MIDI channel. Per voice channels support pitchbend, aftertouch, mod wheel, and Performance control assignment messages. Controllers and MIDI messages sent on the base channel affect all voices.

  • Mono Mode Bend Range: Tap to open a window and set a value from 0 to 96.

    The chosen pitch bend range affects individual note pitchbend messages received on all but the assigned Base Channel. The default is 48 semitones, which is compatible with the GarageBand for iOS keyboard in pitch mode. When using a MIDI guitar, 24 semitones is the preferable setting because most guitar to MIDI converters use this range by default.

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