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    <p>This arrangement will fundamentally never work. </p> <p>GCD is a thread-pool designed to facilitate task-level parallelism. It is usually asynchronous and non real-time. These are almost precisely the opposite characteristics to those required in an audio application.</p> <p>Each thread servicing a GCD queue is contending with other threads in the system for an opportunity to execute. Furthermore, the queue may be busy at requested time processing something else. If that <em>something else</em> is long-running - and long-running tasks are precisely the kind of thing that GCD is made for - the scheduler may pre-empt the thread before the operation has completed and penalise the queue; it may wait a long time for service. </p> <p>The <a href="http://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man3/dispatch_source_set_timer.3.html" rel="noreferrer">Manpage</a> for GCD states the following about timers on GCD queues: </p> <p><em>A best effort attempt is made to submit the event handler block to the target queue at the specified time; however, actual invocation may occur at a later time.</em></p> <p><code>NSTimer</code> will not be any better. Its documentation states <em>A timer is not a real-time mechanism</em>. Since you'll probably run this on the application's main run-loop, it will also be very unpredictable. </p> <p>The solution to this problem is to use lower-level audio APIs - specifically <em>Audio Units</em>. The advantage of doing so is that soft-syth units have an event queue which is serviced by the unit's render handler. This runs on a real-time thread, and offers extremely robust and predictable service. Since you can queue a considerable number of events with timestamps in the future, your timing requirements are now quite loose. You could safely use either GCD or a <code>NSTimer</code> for this. </p>
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    1. COThank you , I'll look into this
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