I think my idea with the robot arm is what I need.
Now my concern is how to control it. It would be great to have the ability to take the robot with me. I work in different studios around, so I need to take it with me to the studio, and set it up pretty quickly, and control it via wifi maybe. some kind og wireless control would be the optimal.
So my vision for the robot is, I go to the studio with the robot in my bag or car, then I go to the recording room with a guitarist and hes guitar amp. I place the robot in front of the guitar amp and place a microphone on the robot-stand and gives the robot some power, then I go to the monitor-room/control-room and set up my control-surface (maybe my mac pro), connects to the robot, and then I'm good to go and ready for the sound check. Here I let the guitarist play through hes guitar amp and I listen to the microphone and move the microphone around the speaker on the guitar amp. I only need to move the mic some inches, so it wont run over any cables or so. When I've found the perfect spot for the microphone, I'll just let the microphone be where it is and press "record"
I hope that resolves any misunderstandings.