The WAVEFORMATEX structure defines the format of waveform-audio data. Only format information common to all waveform-audio data formats is included in this structure. For formats that require additional information, this structure is included as the first member in another structure, along with the additional information.Formats that support more than two channels or sample sizes of more than 16 bits can be described in a WAVEFORMATEXTENSIBLE structure, which includes the WAVEFORMAT structure.[...]nChannels Number of channels in the waveform-audio data. Monaural data uses one channel and stereo data uses two channels.