Basic pre-amp for DMX controller

[daneo]

Hi,
I may be asking questions in he wrong forum so please direct me in the right way thanks.
Here is my problem: I have a DMX controller which is sound activated unfortunately the inbuilt mic is next to useless and has no control over the sensitivity. I does however have a audio input (RCA) which is labeled 0.01/1 VP-P. I have used this to connect to rca line out from mixer. I also put a potentiometer in line to adjust the sensitivity. This works sortof ok. But I have better ideas I have a diagram which hopefully explains what i would like to achieve
From what I have learnt the mini mic does not provide enough volts so a pre amp is required. (Note: Audio quality is not important! I hope this makes it a much easier to build.) I then want to adjust the sensitivity of the mic signal depending on the music volume. Also I would like to control what frequencies are let through. Eg I want to have the drums activate the DMX lights so high-cut strings etc, but low-cut the deep bass. Hope that makes sense!
I was hoping I could get a maybe a schematic diagram and parts list for this little project from you experienced people and of course some good advice.
I am a newbie at this so if I have not provided enough info, not clear or something else please let me know.
Thanks for reading through anyway.
Dane