I was wondering if there is anyone tried of using two of the same kind of controllers lets say radium49 +radium49 into one midi channel through USB. Will it have conflict or they can be played as though it is 49+49 key controller???
I assume you are talking about going either into two separate USB ports or splitting one with an adapter...
If your software allows it, you could record two separate softsynths at the same time if you set the 2 Radiums to different midi channels. Other than that, I can't see any point to doing what you are asking about. And no, ganging up the Radiums will not result in a 'Super Radium' with 98 notes available.