mciSendString, How to get the recorded buffer?

Question

I'm creating a recorder using MCI through the DllImport of winmm.dll: mciSendString.

I am able to record and save it. I would like to do some processing on it before saving but I did not find any proper way, method, trick to get the buffer during the recording(again, without saving to a WAV file first)?

Any idea?

mciSendString("open new type waveaudio alias recsound", null, 0, IntPtr.Zero);
mciSendString("record recsound", null, 0, IntPtr.Zero);
//Would like to get the buffer here
mciSendString("pause recsound", null, 0, IntPtr.Zero);
//or here