four-input by four-output matrix mixer. Ideal for feedback loops and
complex processing. Operates in unipolar or bipolar mode per output
stage. In unipolar mode the signal attenuator runs from full attenuation
to full signal. In bipolar mode the attenuators run from inverted
signal to zero mid-way to positive signal. This added flexibility
is great when dealing with control voltages. Of course, the Matrix
Mixer is fully DC coupled.