The sound engine select button when pressed opens the above overlay.
You can slide left or right in the carousel of sound engines.
By clicking on a sound engine, the preset list is auto-populated with the sound presets of that sound engine. A default preset is selected as soon as a new sound engine is selected.
The preset picker scrolls vertically there the highlighted preset name is the active preset.
All selected notes on the keyboard use the same preset.
It is never possible to have more than one preset selected at any time.
You can select ‘Advanced’ to access a series of parameters available by the synthesiser for customisation. All sound engines have unique advanced parameters. When you change a preset, the changes in parameter values are reflected. If you customise a parameter it remains until you select a different preset.