Symphony I/O Mk 1
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      Which I/O Modules may be installed in Slot 2, the upper slot?

      Once an I/O Module is installed in the lower slot (Slot 1), any second I/O Module may be installed in the upper slot (Slot 2). However, a Mic Preamp module can only be installed in the upper slot and a Mic Preamp module most only be installed in units with an 8x8, 16x16, or 16AD module installed in the lower slot.