You can get more informations about Ujam Striiiings here: https://www.ujam.com/symphonic-elements/striiiings/
With this layout you can control the Striiiings plugin even if you do not play a keyboard. The chords section that we open by touching the Mididesigner logo allows you to transmit chords without touching a keyboard.
If you use Unify from PluginGuru (https://www.pluginguru.com/products/unify-standard/),
you can control also the Key, Speed and Sync parameters. Just drag the preset in your Unify.