This Ableton tutorial covers how Wavetable's Expanded view works as a unified modulation workspace, and how to add any parameter as a target in the Modulation Matrix.
Toggling Expanded view combines all individual matrices into one, with MIDI modulation targets displayed on the left. A default Wavetable instance already includes Oscillator 1 position, Amplitude, and Pitch as ready-to-use targets. Any additional parameter, like filter frequency, can be added instantly by clicking it with the mouse cursor.