I just got into recording and I'm looking to buy a mixer. I have a few questions. I'm using Pro-Tools and have a M-Box2 2-channel inut sound compressor. I'm looking to expand on the number of input channels. I do not need anymore than 16 channels. Is there any particular compatability issues with Pro-Tools that I'm not aware of? Also, any suggestions as to what kind of mixer I should get would be appreciated.