Up until yesterday I had problems with my new Ketron SD1000 sound module not working properly.The active sensing message ewas causing the SD1000 to bug with the Midi Port.

I have since been put onto a company called "Midi Solutions".
Their various product have built in Midi filters,except for products called Thru Boxes and Power Adapters. I bought a Programmable Input Selector.Connected it up between the digital piano and the SD1000 with Midi cables and it works perfectly.

http://www.midisolutions.com/products.htm