Indeed, such nonlinear sound waves have now been shown to exist at lipid interfaces that show superficial similarity to action potentials (electro-opto-mechanical coupling, velocities, biphasic pulse shape, threshold for excitation etc.).
Certainly, these nonlinear acoustic waves are now confirmed to occur at lipid surfaces that share similarities with action potentials in terms of electro-opto-mechanical coupling, velocity characteristics, biphasic pulse patterns, and the threshold required for activation.