The double mixer is a 6 HP module that, as the name implies, has two mixers: a golden one and a purple one. As usual, round jacks are inputs, and hexagonal ones are outputs. The golden mixer has two inputs, one that can be attenuated and one that is fixed. It also has one non-inverting output. The circuit is basically an inverting OPAMP for the mix part, and a second OPAMP to invert the signal again. The jack has +5V by default, so the mixer can be used to provide a 0V to 5V signal if it isn't used for anything else.
The purple mixer has all the features of the golden mixer, but in addition it has a third input so it can mix three signals together, and it has an output at the inverted stage. This means it can be used to provide both a 0V to 5V signal and a 0V to -5V signal if no other signals are mixed. It can be combined with the golden mixer for a 0V to 10V and a 0V to -10V signal, if desired.
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