Ketron SD1000 to Roland RD700sx?

I have a new Ketron SD1000 sound module connected up via Midi cable to a 2005 Roland Rd700sx stage piano.,The Roland is set to combine up to 4 tones/sounds plus drums.I can only get 1 sound at a time from the SD1000.And,I had to add a "Midi Solutions" product with built in Midi filter which corrected 1 problem where I couldnt access all 128 sounds on each of the 4 banks.When I added the Midi filter,it allowed me to access almost of all the sounds.I just cant combine 4 to play them on the RD700sx.
From what I've been told,there is a Midi port bugging issue.Apparently its like that with all SD1000.I also have the SD2 sound module which I can access all sounds on each bank but I cant combine 4,the same problem I have with the SD1000.
I cant afford to upgrade with DAW software and an ipad/tablet to run it.It would be nice to connect up piano,module and ipad via USB like in this video:
https://www.youtube.com/watch?v=ixqOz1MXG1U
Has anyone been able to corrent the fault with the SD1000?
From what I've been told,there is a Midi port bugging issue.Apparently its like that with all SD1000.I also have the SD2 sound module which I can access all sounds on each bank but I cant combine 4,the same problem I have with the SD1000.
I cant afford to upgrade with DAW software and an ipad/tablet to run it.It would be nice to connect up piano,module and ipad via USB like in this video:
https://www.youtube.com/watch?v=ixqOz1MXG1U
Has anyone been able to corrent the fault with the SD1000?