Is it possible for 8051 to control S1MP3 Player (Chinese MP3 Player)?

Due to its low price, I want to use it as a replacement of Voice Recorder chips.

The simplest way (the one I currently use) is to replace buttons with digital switches, but it has many limitations such as slow response for track changes, and unreliable track targeting.

What I want to do is to control the audio processor (some using ATJ2085) directly using 8051, or re-program the controller (I think they're using ICE) to link with the 8051 controller. I'm still on my way of learning them (yeah, trial and error), perhaps some of you have clues, please share it with me.