I would like to have some recommendations for tape or "fields of sound" tour systems. I have been away from these systems for quite some time and I'm sure the technology and reliability have advanced in the meantime. Thanks, Rob -- Robert O. Dahl, Science Center Manager Biosphere 2 Center a non-profit affiliate of Columbia University Hwy 77 / P.O. Box 689 Oracle, AZ 85623 Internet: email:<[log in to unmask]> http://www.bio2.edu/