The CM-3 changed the game once again by doubling the number of probe tips to 4 and achieving magnet compatibility. This enabled our collaborators to begin utilizing both FMRI and MEG with the device to perform real-time recording of the cortical activity elicited by sensory testing. Utilizing high-quality piezos instead of the VCAs, the CM-3 sacrifices position control for its magnet compatibility. Although the piezos are calibrated to optimal performance before leaving the lab, positional accuracy cannot be guaranteed in any open-loop system. Nonetheless, the CM-3 remains the most advanced magnet compatible four site vibrotactile stimulator on the market.