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Lab 3: Audio
Blocking mode ('OK to Block') will apply upstream backpressure, which is good when the Audio Sink is the only hardware device in the flowgraph.
This can be problematic if the flowgraph source is, for example, a USRP. The source is then also hardware that has its own internal clock and will be throttling the sample production rate while the Audio Sink is throttling consumption with its own unsynchronised clock. This is called the 'two clock' problem.