The full-time person can help to establish budgets, maintain equipment, write software, act as an assistant for faculty computing problems, and even offer a course or two to augment what you might be doing. This person might also develop and maintain your web site as he or she is sitting in the lab. It doesn't take too long to create a job description that clearly needs a full-time individual. Great news about your lab, Bill. Staff it well.
People are far more important than the machines and software.
Blat has touched on a number of good suggestions. Borrowed space . Add your music software and hardware to a general purpose lab or a lab in the library on your campus that is already staffed by the campus or school. Faculty chaperone . Combine the lab as part of the office of a faculty member or teacher who will watch over the facility.