9 to 16 are routed directly to left or right master. The is a "function" switch were you can decide to use it as summing amp OR micpre. If switched to the micpre position you have two channels with seperate input connectors, a gain pot, phantom power and phase reverse. The summing section has a connector for the buss input were you can connect extension units to arise the amount of direct channels.The master volume works for both functions. The unit comes with an internal OR external power supply (100V to 240V). Besides the Neumann Vintage amp it includes a passive circuit which does not affect the nice colored Vintage sound of the dual channel module (floating transformer balanced inputs & outputs). The unit is not on stock at the moment. Production time is about two weeks. Feel free to ask for different designs, connectors, colors... See also my other auctions!! The item "Neumann 16 Channel Vintage Summing Amp / Mixer V475-2 AND 2 Channel Micpre" is in sale since Friday, February 17, 2017. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Vintage Pro Audio Equipment". The seller is "velvet_audio" and is located in Hamburg. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.