This example shows a custom audio rendering callback that reverses audio playback in real time. The code implements an `OSStatus TSAudioEngine::render` method that clears output buffers, reads audio data from a file, then reverses the sample order of both channels using the Accelerate framework’s `vDSP_vrvrs`. It also seeks backward through the file with `ExtAudioFileSeek`, resetting to a fixed position every 350,000 frames. The rendering uses `AudioBufferList` structures to handle stereo data, with lock-based synchronization to prevent concurrent access.