M/S format Direction Control
The direction control in the M/S stereo format works entirely different from the conventional stereo balance regulation. While a stereo balance control cuts off one of the two channels in the 'Left' and 'Right' positions, the M/S direction control converts the signal to a mono signal from the left or right output channel, when the pot is set all the left or all to the right. In all other positions but center the stereo base width is reduced while the left- right level balanced is modified. The great advantage of this method is that no signals are lost when the control is used.

elliptical Equalizer
The elliptical equalizer generates a frequency dependent crosstalk between the stereo channels. The scale shows the frequency where the crosstalk is 15 dB. With lower frequencies, the crosstalk value is lower; higher frequencies cause a higher crosstalk value. The steepness of the curve is 6 dB/oct. Setting the control to 300 Hz causes no audible changes in the stereo base width.

The elliptical eq improves the mono compatibility in the bass frequency range and can reduce problems caused by base width settings of more than 100 % stereo.