In this excerpt from a Bitwig Grid tutorial, the presenter patches a vibrato that fades in gradually over a held note rather than appearing immediately. The technique uses an AR envelope running through a built-in amplifier to control the depth of an LFO before it reaches the pitch input, so the initial transient stays clean and the modulation swells in naturally.
A key detail: an AD envelope won't work here because it has no sustain stage and collapses before the vibrato has time to develop. Switching to an AR envelope gives the modulation somewhere to live while the note is held.
Slowing the attack time and adding a curve to the envelope shape makes the fade-in feel more gradual and expressive. The result is a performance-ready vibrato that behaves more like a human player would approach it.