10.6

Table Of Contents
56Logic Pro Instruments
You can set Position and Speed to 0% and can modulate Position with a unipolar LFO,
MSEG, or a performance control linked to the modulation wheel. When Position is
modulated and Speed has a value greater than zero, the playback path is determined by a
combination of modulation value (whenever this value changes) and the normal path (at a
rate determined by Speed whenever the modulation value is static).
1. In Logic Pro, from the Name bar, click the File button and choose Initialize Preset from
the pop-up menu to reset all Alchemy parameters to default settings.
2. In source A, import a rhythmic or melodic sample that loops evenly.
3. Turn the source A Speed knob down to its minimum value of 0%, and play a few notes.
You will hear that playback is frozen at the very beginning of the sample.
4. Do one of the following:
Click the Position knob to select it as a modulation target, then click the first
modulation rack slot, and choose LFO > LFO 1 from the pop-up menu.
Control-click the Position knob, then choose Add Modulation > LFO > LFO 1 from the
shortcut menu.
Note the orange arc that appears around the Position knob. This indicates that the
parameter has a modulation assignment.
5. Click the LFO button in the modulation section if the LFO controls are not visible, then
choose Basic > Ramp Up from the LFO Shape selection pop-up menu. Also in the LFO,
turn off the Bipolar button.
This routing increases Position smoothly so that the entire sample plays back from
beginning to end, then jumps immediately back to the beginning and continues to loop.
6. Adjust the LFO Rate if loop playback is too fast.
7. Finally, adjust the Logic Pro tempo as you play additional notes to confirm that the loop
is properly synchronized.
Note: It is unnecessary to freeze playback by setting Speed to 0% (as performed in
step 3) before modulating Position with the Ramp Up LFO shape. This is because this
LFO shape is constantly changing, without any static/flat portions and thus is always
controlling play position, making the Speed value irrelevant. If you use a different
LFO shape with static/flat portions, however, setting Speed to a non-zero value would
cause play position to be controlled by a combination of the LFO shape and the normal
playback behavior of the sample.