SPEAKER_BACK_CENTER 196 modules/dx_hw/dx_audio.c if (channel_cfg & GF_AUDIO_CH_BACK_CENTER) format_ex.dwChannelMask |= SPEAKER_BACK_CENTER; SPEAKER_BACK_CENTER 243 modules/wav_out/wav_out.c if (channel_cfg & GF_AUDIO_CH_BACK_CENTER) format_ex.dwChannelMask |= SPEAKER_BACK_CENTER;