A Changeling's shapechanger feature allows them to change their voice as an action. But unlike Kenku, the actor feat, and Rogue(Assassin)'s impostor feature, "mimicry" isn't mentioned.
Are Changelings able to innately mimic voices or is some check required when trying to imitate a voice/vocal mannerisms?
If no check is required, what is the upper limit? Could they transform into a Kenku and use their actions to replicate that race's mimicry of any sound (e.g adopting the appearance of a Kenku, then changing tiny parts of their appearance as they change their voice to a dolphin or between other humanoids)