Vienna Performer is Vienna Symphonic Library's AI performance plug-in, released on 9 November 2026. Load it on an instrument track, play your MIDI back once so it can capture the part, and press Render: VSL's servers return the line as a performance with phrasing, bow direction, breath, vibrato and natural timing, recorded in the acoustic of Stage A at Vienna Synchron Stage. Your notes and dynamics stay exactly as you wrote them, because the model performs rather than composes.
The launch line-up is five soloists (violin, cello, flute, clarinet, French horn) and four string sections recorded at real sizes, from 14 first violins down to 10 cellos. Every render arrives as FLAC with Room (Decca Tree) and Close stereo pairs, and VSL ships matching presets so Synchron libraries sit next to it without extra processing. Plans run from €9.99 to €49.99 a month and differ only in performance minutes; a minute is one minute of one instrument, phrases are charged in 10-second steps, and only the phrases you change render again.
The trade-offs are clear. It is not an orchestra on its own yet, rendering needs internet, re-renders can come back slightly different, and there is no standalone or MuseScore support. Next to Vienna Essential Orchestra it is the player for the lines a library struggles with, rather than a replacement for one.
Our Vienna Performer first look covers the meter, the plans and how it compares with BBC Symphony Orchestra and Hollywood Orchestra Opus.