If you're getting long strings of 'U', this means a *gross* sample-rate mis-match somewhere in your flow-graph, rather than the more-subtle "two clock" problem.
Make sure that everything agrees internal to the graph about sample-rates, and, perhaps more importantly, that your audio *hardware* is capable of delivering the desired rates.
On 2015-03-17 10:30, Larry Van Der Jagt via USRP-users wrote:
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