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[[File:Hordijk am.png|thumb|right|200px]]The 4U [[MU]] or 5U [[MOTM]] '''Rob Hordijk Active Matrix''' module is a fully buffered eight by eight matrix where any one of eight input signals can be added to any one of eight outputs. By using ¼-inch tip-ring-sleeve insert jacks for the matrix nodes (equal to stereo jacks) a whole range of applications ecome possible. First the column input signal is buffered and then routed to the tips of the nodes in that column. The ring signals of the nodes are basically summing inputs and summed to the final output signals at the ends of the rows. By connecting a stereo jack where the tip and the ring are connected directly together, a connection with unity gain is made from a column input to a row output. If the tip-ring connection in the jack goes through a resistor an additional attenuation can be accomplished. E.g. a 30k resistor will attenuate by
[[File:Hordijk mb.png|thumb|right|200px]]When a stereo audio cable is soldered to a jack plug and on the other side of the cable a potentiometer is attached the potentiometer will act like a pot on the node, enabling to set the mix level by the pot. Basically each node is an insert, just like the inserts on a mixing desk. And can thus be used in the same way. So, using a jack with a pot means to ‘insert’ the pot into the signal path. This means that you can insert any other outside world device in the signal path by using an insert cable with a stereo jack on one side and two mono jacks on the other, provided signal levels match of course (e.g. 5V pp oscillator output signals will severely overload line level inputs on e.g. a digital effects rack or the guitar input of a stompbox). One could also connect a resistive sensor like a light dependent resistor (LDR) to a jack and make the node light sensitive.<ref name="rh" />
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== Mini Mix ==
Mini Mix is a mixer module to turn patch points into mixers like a matrix mixer.<ref>
{{From Muff Wiggler wiki|Rob Hordijk Designs}}▼
== References ==
{{reflist}}
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