Glensound COPPER 29/S Single Rack Mount Digital Telephone HybridGlensound invented the worlds first hybrid in 1966 for the BBC. Current technology, combined with the Glensound Engineers understanding of digital systems for audio, have presented the environment to develop the ultimate telephone balancing unit. Glensound presents the Copper 29 as part of the Atomic range, as it is considered to excel in its application. Analogue and Digital I O The maximum flexibility is offered with analogue and digital audio