The MMC-1, excluding the Sub1, Sub2, and Sub3 outputs actually has 7 outputs. Front right and left, Surround R & L, Rear surround R & L and the center channel. Each of these would match up to the seven inputs on the IPS-1. Each of the seven channels outputs would be connected to it's own input on the amp's input.
For example Front right would go to Channel one, front left to channel two, and so on. From there, each speaker is connected to the IPS-1 output.