I'm doing a demonstration for students using a Chladni plate. My setup is similar to this one,
consisting of a single frequency-generator attached to an amplifier that vibrates a round or square metal plate. I am able to use 6 or 8 different [sine wave] frequency settings to create many interesting patterns like you see in the video.
My training is not in physics, but rather in music with a hobbyist-level interest in acoustics. I'm wondering what it would look like if the plate was subjected to a more complex waveform. For example, what would I expect to see if I could apply two frequencies that I know create interesting patterns at the same time? What about 2 sine waves superimposed in a 2:3 or 3:4 ratio, as we often use in music? What about other waveforms like triangle, sawtooth, etc.? I have only a single sin-wave generator so I can't really experiment on my own.