Have you checked any other guides for audio recording with the Intel Edison? I was looking for similar guides and found this one from Sergey http://www.malinov.com/Home/sergeys-projects/audio-block-for-intel-edison. It uses an audio block that provides playback and recording capabilities, so both product have similar characteristics. I’m not about the communication protocol of the Grove Recorder, the Audio Block from the guide uses the I2S/DSP interface of the Edison. Also, for reference information it would a good idea to take a look at the Edison Audio Guide, http://download.intel.com/support/edison/sb/edisonaudio_332434001.pdf.