Hi Don:

'preciate the info. I kind of heard about that too awhile ago. I think that will help get you down to sample frequencies as low as .05 Hz or so. To go lower though it may not be capable enough. But in a tight space that could be the best compromise.

Maybe the n. CA. elf project takes advantage of that technique. I guess I'll order one and find out.

Take care...mark on the coast (east that is...)