Using VST Instruments
A Virtual Studio Technology instrument (VST instrument or VSTi) is a software-based synthesizer you can use to create audio from your MIDI tracks. You use a software synthesizer much like a hardware-based synthesizer: in the same way you can route a MIDI keyboard to an outboard synthesizer module, you can route MIDI tracks to a VSTi soft synth or ReWire 2.0 device application.
VST instruments are added to your project as soft synth bus controls in the Mixing Console window. Routing a MIDI track to a soft synth bus control will cause the track to be played through the VST instrument, and you can use the Soft Synth Properties dialog to choose presets and adjust instrument settings.
NOTE You can add up to 32 soft synth bus controls to your project. If the project includes VST instruments with multiple outputs, each output is added as a separate soft synth bus.
TIP If you change the number of outputs from within a multiport VST instrument after adding the soft synth to your Acid project, the Acid Mixing Console window will not reflect the change if the VST instrument does not notify host applications of dynamic port changes.
Add a VST instrument
to your project
Add or remove soft
synth busses for multiport VST instruments
Load or save VST instrument
effect presets
Load or save VST instrument
effect banks
Enable or bypass a
VST instrument
Route a MIDI track
to a VST instrument
Play a soft synth with
a MIDI device
Automate VSTi parameters
Last modified on July 09, 2026
Was this page helpful?
What did you particularly like about this page?
What did you dislike about this page?
Thank you for your feedback.
button in the Mixing Console window. The Soft Synth
Chooser is displayed.
in the Mixing Console window.
. The Open VSTi Effect Preset dialog is displayed.
. The Save VSTi Effect Preset dialog is displayed.
. The Open VSTi Effect Bank dialog is displayed.
. The Save VSTi Effect Bank dialog is displayed.
on the
and choose a port from the menu.