Several properties of incoming MIDI note data, as well as values generated per-note by Alchemy, are available as modulation sources.

Note: unlike the other modulators, Note Property has no control panel to display.

Click a slot in the modulation rack and choose ‘Note Property’ from the pop-up menu. A sub-menu appears, from which the following options are available:

• ‘Velocity’. Modulation based on the velocity values of incoming MIDI note data.
• ‘KeyFollow’. Modulation based on incoming MIDI note numbers (i.e. the modulation value increases as you play higher pitches on your MIDI keyboard controller). This is a bipolar source, with C3 corresponding to zero.
• ‘ChanAftertouch’. Unipolar modulation based on channel aftertouch data.
• ‘PolyAftertouch’. Unipolar modulation based on poly after touch data.

Note: Channel aftertouch is transmitted by many MIDI controllers; it consists of one variable stream of values per MIDI channel. Poly aftertouch, which consists of a variable stream of values per individual note, is a much less common feature. If your controller doesn’t produce poly aftertouch (or channel aftertouch, for that matter), you can probably still create data of this type directly in your sequencer software.

• ‘Speed’. Modulation based on the elapsed time between notes (e.g. a progressively slower sequence of notes results in progressively greater modulation values).
• ‘Held’. A modulation signal that rises to full-scale immediately at note-on and falls to zero immediately at note-off.
• ‘FlipFlop’. A modulation signal that is alternately full-scale and zero on successive notes.
• ‘FlipFlop2’. LikeFlipFlop, but the value reverses every two notes: zero, zero, full, full, repeat.

Note: The FlipFlop modulators can be used together to create a ‘round-robin’ involving all four of Alchemy’s Source modules. With the Morph mode set to ‘Morph XY’ or ‘XFade XY’, set the Morph X and Y knobs both to 0%; then modulate X with FlipFlop and Y with FlipFlop2 (or vice versa). (See the Morph page for information on morphing and cross-fading.)

• ‘Random1’ – ‘Random4’. Modulation based on a fixed random value per note. This is a unipolar source with values ranging from zero through full-scale. The four sources of this type are randomized independently of one another.
• ‘PitchBend’. Modulation based on MIDI pitchbend messages. This is a bipolar source with values ranging from negative full-scale through positive full-scale.
• ‘Max’. Modulation based on a constant full-scale value.
• ‘ChanAftertouchBipolar’. Bipolar modulation based on channel aftertouch data.
• ‘PolyAftertouchBipolar’. Bipolar modulation based on poly aftertouch data.

Note: the bipolar Chan- and Poly- aftertouch modulation sources start with half of the full modulation amount applied to the target parameter. Incoming MIDI aftertouch data modifies the initial amount by +/- 50%. This contrasts with the unipolar Chan- and Poly- aftertouch modulation sources which have an initial value of 0, increasing towards 100% as aftertouch is applied.