CV-8 Gateway is a free helper extension that intelligently switches between multiple CV sources.
It is designed to compliment AS-16 Analog Sequencer, but can be used with any other CV device.
CV-8 was designed to allow multiple chained AS-16 sequencers to be connected together. However it may be of use in other situations where many CV outputs need combining.
CV-8 is intelligent, it uses the last active Gate input to decide which CV pair to route to the output rather than simply adding all the values together.
Please see the AS-16 manual at http://www.dldtechnology.com/?page_id=137 for usage examples.