You can use the Sampler LFO ramp generator to set the time it takes for the LFO modulation to fade in or fade out. When you set the Fade field to a value of zero no fade in or fade out occurs.
In MainStage Sampler:
To fade in the modulation: Click the Fade In button, then vertically drag the Fade field to a value greater than zero.
The higher the value, the longer the delay time before the LFO modulation starts.
To fade out the modulation: Click the Fade Out button, then vertically drag the Fade field to a value greater than zero.
The higher the value, the longer the fade out time for the LFO modulation.
You may often use the LFO ramp generators to introduce a delayed vibrato; many instrumentalists and singers intonate longer notes this way.
In MainStage Sampler, click the Mod Matrix button in the Navigation bar to view the Mod Matrix pane.
Click the + button to create a new modulation routing.
In the modulation routing, choose Pitch in the Target pop-up menu and choose LFO 1 in the Source pop-up menu.
Set a slight modulation intensity with the Amount slider.
In the Modulators pane, set an LFO 1 Rate of about 5 Hz.
Choose Triangle in the LFO 1 Waveform pop-up menu.
Tip: Chaotic and fast modulations of frequencies (choose Pitch from the Target pop-up menu) by any LFO source—with a delayed Random waveform, a high Rate, and short fade-out time—are ideal for emulating the attack phase of brass instruments.
Click the Fade In button, then vertically drag the Fade field to a value greater than zero.