How to voice record from MBP to iPhone 6s Plus?

Hello, I used Voice Candy on my Mac to record some voice. Playback is find and clear. However, since it is a demo program, I just found that it cannot save the recording. I place the bottom of my iPhone 6s Plus on top of one of the side speakers of the MBP 17 2010. I played back the recording and used voice memo to record. When I played back, the sound volume is low. What is the proper way to do it?

I recall that I once used voice memo to record a meeting. When I played it back, I had the same problem. The volume was so low that even I put my ear next to the iPhone, I could not hear it clearly.

 

Thanks. Didn't know of such feature. It is now too late. What shall I do?

Anybody knows why playback volumn from voice memo is so low?

 

Because recording of the original conversation had been done before I made the original post.