Is it possible to use a single knob to transition from RGB to white tunable?

If I bought a 5 in 1 LED light with the DMX Dimmer and the power supply, Would it be possible to use a single knob to transition from RGB to white tunable?

While our DMX decoder would be a great option for our 5-in-1 LED strip lights, the controls are accomplished via digital signals only, so there would unfortunately not be any knobs or dials that could accomplish this.

​That being said, there may be some third-party DMX controllers which incorporate analog inputs that can be programmed to achieve the functionality you are looking for.