For the initial 1.0 release of the Symphony Desktop, all features and functions are done on the Symphony Desktop touch-screen interface. This includes enabling and using the Preamp Emulations.
For controlling plugins like the ECS, Clearmountain's Domain and Spaces, and the five FX Rack plugins, those are adjusted in your recording software (DAW) and are only native plugins for this release. Other workflows such as using plugins in a Dual-Path Monitoring or Print mode that use DSP on the Symphony Desktop will come in a future feature release.
You can review our Feature Release Schedule here: https://apogeedigital.com/support/symphony-desktop#schedule
For more general information about the Symphony Desktop, see this article: Symphony Desktop: FAQ's