Hello all, I'll start by explaining that this is my first post, and I have very little engineering and mechanical knowledge. I am currently completing my phd in neuroscience so the purpose of this post is to seek information to indulge in some of my hobbies :) I am designing a machine with which I plan to observe sound wave properties. It is important to me that these observations come from a live model, rather than using software replication. Putting it simply, I want a vertical rod (metal, between 1-2ft long, 1/4inch diameter) to vibrate. I would like to be able to control the frequency as well. I have brainstormed ideas involving oscillatory motors or by use of speakers. I am currently learning welding techniques and have access to tools for cutting as well. Thanks!!