Vortex Sound Research

I am working with someone right now on a custom synth build that would involve recasing two desktop synths into one cabinet with a keybed and want to put a monitor between the two modular desktop synths, that would basically show the waveform activity, looking for suggestions on what options might exist that would be fairly easy to implement in this manner. Thanks in advance for any suggestions, I will post the finished design here when it gets built.