User`s guide

Deconstructing Signals
3-61
The Signal From Workspace block generates a two-channel frame based-signal
with frame size 4 (because the
Samples per frame parameter is set to 4). The
Unbuffer block unbuffers this signal to a two-channel sample-based signal.
Note The Unbuffer block generates initial conditions (not shown in the figure
above) with the value specified by the
Initial conditions parameter. See the
Unbuffer reference page for information about the number of initial conditions
that appear in the output.
Reordering Channels in a Frame-Based Multichannel Signal
Use the Permute Matrix block to swap channels in a frame-based signal.