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//! [desc]
QAudioRecorder *recorder = new QAudioRecorder();
QAudioProbe *probe = new QAudioProbe;

// ... configure the audio recorder (skipped)

connect(probe, SIGNAL(audioBufferProbed(QAudioBuffer)), this, SLOT(processBuffer(QAudioBuffer)));

probe->setSource(recorder); // Returns true, hopefully.

recorder->record(); // Now we can do things like calculating levels or performing an FFT
//! [desc]