Unless you need all 64 (8x8) combinations, then use the custom serial boxes to program the RS232 switch codes you need.

Depending upon the matrix, it may be possible to put more than one code in to the box - enabling you to switch a group inputs/outputs. With 6 serial control devices, you have 60 command spaces...

Richard has included matrix control for a few different matricies in as a dmx device - including gefen is a question for him - he's really busy at the moment though....

Do you have all the command codes available/listed? If so - please post them here in a logical format...

Simon