Set wave in device for this interface instance.
virtual __stdcall int SetWaveInDevice(unsigned int nIndex) = 0;
User can specify wave input device for each interface instance. If you have multiple soundcards, with this function you can specify input soundcard. You can also create 2 interface instances and record 2 songs, each song on different soundcard.
Default wave input is set to WaveInWaveMapper (class is using waveform-audio input device capable of recording the given format).
This function has effect on next call to play function. If you call this function while song is playing there is no effect. You need to stop playing and start playing again to apply new settings.