As i've gotten bored and been looking around I came up with an idea. I found out it's not that original and i've been doing my homework. The same kind of idea was asked here but not quite answered in the way i'd like. What I am aiming for is to be able to write my own application to interface with a fanbus to modify the fans speeds without using any microcontrollers. I would rather be able to modify each fan independently but I wouldn't mind if I could only modify the speed of all of them together. I've got general electronics knowledge and I can follow beginner-moderate schematics. I've been looking at digital potentiometers and wondering if maybe they could be used. I also have a good knowledge of programming, i've yet to try and interface with the serial port but I don't have any problems with spending multiple hours reading up on the topic. Now if I have missed a device or schematic like this that doesn't involve any complicated microcontrollers and someone could point me to it i'd appreciate it. I'm a regular over at the Gideontech forums under the same name and my inspiration for the mod was here. I want to make a cd-rom like looking box (more than likely plexi) to sit behind my lcd screen and hold the connections for the fans. That way I don't lose a 5.25 bay and I still retain control over my fans.