Another method of achieving the same optical effect is to get a tin or metal can of some sort, open at both ends, and stretch a party balloon, or possibly some other elastic material, over one end. Next, attach a small mirror, or a piece of a mirror, on the external side of the elastic material. Any adhesive or glue would serve this purpose. A coffee can would work well here.
If you direct sound waves internally into the open end of the can, and an optical beam is reflected off the mirror, the desired Lissajous figure will be apparent at the reflected beam image point.
The advantage of this method is that you could simply direct the output of an audio speaker into the open end of the can. Then reflect the laser beam externally off the closed end of the can.