Thanks for your correction. I looked at the manual immediately which usually is the most complete information. In this case it is NOT. Anyway I would not accept the blackbox as a replacement for the Alesis.
I notice that they have basic noise and THD+Noise specs on the website which would indicate that they use mid level A/D's. Knowing that the JoeCo company was formed by people who previously contributed to the development of the Sadie system I would be fairly confident that it would work as expected.
James.