This Ableton tutorial walks through building an arpeggiated vocal sound in Wavetable, starting with a wavetable from the Formant category. Formant wavetables are named after vowel sounds, and they carry a strong vocal character that makes them a natural choice when you want a synth to feel like it's singing.
To add movement, LFO 2 is set to Retrigger mode, which resets the LFO each time a key is pressed. This keeps the motion rhythmically locked to each note in the arp rather than running free.
A second oscillator is then layered in, pulling from the Instrument category with a Marimba wavetable. The Modulation Matrix connects pitch to wavetable position with a negative value, so higher notes scan lower into the wavetable. That kind of inverted mapping is a quick way to give a sound more harmonic variety across the keyboard.
The final step adds the sub oscillator to reinforce the low end and give the whole sound more body.