BTW, can JACK handle several HW interface using
different blocksizes
at a time (assuming sample frequencies are coherent) ?
multiple devices: we leave that to ALSA. we just open one ALSA PCM
device, which may or may not correspond to a hardware
audio interface. ALSA can handle a variety of these
situations, but AFAIK, it does not handle sample clock
drift and related issues.
different blocksizes: hard to even define, really, but pretty much
beside the point given that multiple devices are handled
by ALSA.
--p