I don't have an Alpha or a DX6, but I was able to buddy box with my DX7 as a master and an old JR sport 4 channel analog radio as a buddy box. I was unable to get it trimmed enough for hands off flight on the JR, but it was still manageable. The buddy box for a computer radio doesn't necesarily have to be another computer radio. I have attempted to use a Futaba as a buddy box, but for some reason the DX7 didn't like Futaba.