FATMIXER                        Scott R. Gravenhorst
                                chordman@concentric.net
                                06-27-96

FATMIXER.GIF is a simple mixer that can be used to add
any number of devices to a FatMan through the VCF input.
Only 2 channels are shown, but as many channels may be
constructed as necessary.  Mine has 10 right now.  The
design is a simple opamp preamp connecting to a summing
node and coupled to the filter through a 100K gain trim
pot.  The gain and impedance components should be
determined by the device supplying the input to a given
channel.  The gain of the channel will be Rg/Ri.  Because
all of the devices I have attached to mine produce an 8
volt output signal, my Ri and Rg resistors are the same
value to produce unity gain.  The Master Gain Trim pot
allows adjusting for maximum drive to the filter without
clipping.