The term is actually called "Mixer" and seems to be a term used mainly in chiropractic colleges to further divide the chiropractic profession. For what it is worth a mixer is a chiropractor who treats no only the spine but the extremities and utilizes tools other than his or her hands. Modalities such as ultrasound, TENS and weight equipment are tools that a mixer would use.

Strights VS. Mixers is as old as chiropractic. Straights are strictly the spine but even these chiropractors divide themselves into upper cervical VS. whole spine.

Todays new graduates wielding there enormous school loans soon drop this Straight VS. Mixer nonsense and either becomes a doctor that studies to gain knowledge in efforts to help people get better or dies on his or her sword.