I am simply trying to modulate a wav file sampled at 22.05kHz, then demodulate it. The audio output is choppy and I get errors in the console output ("volk warning, no arch found... though I've run the profiler. And aUaUaU....). I guess the issue is with matching sample rates but I've gone through the graph several times and haven't found it.
Also maybe this is related: after I add the bottom row of components (channel model and beyond) the constellation diagram for the transmit side changes to flat. Meaning, instead of a circle, it's a line (second screenshot below). What's going on?