Yes you can. Typically users will post their material in either the General Music Discussion section if it's about their band or solo project (Please do not spam it. One post is enough.), the Recording Studio section if it's a new demo, or a mix you'd like advice on, the Pickups, Electronics & General Tech if you're doing some type of product demo, or even the Live Performance & Stage Sound section if you have some live audio or video of you/your band and would like feedback about some aspect.