The violist (Amy herself, a professional orchestral musician) performed with deeply musical phrasing. The sampled attacks vary naturally – sometimes soft and breathy, sometimes sharp and aggressive – based on velocity. This mimics how a real player responds to touch.
Below is a long-form article suitable for a music production blog or review site.
: The query suggests the user is looking for a torrent download of a music production plugin. This plugin, "Atelier Series Amy", is presumably a sample-based virtual instrument designed for use in digital audio workstations (DAWs).