D16 added some worthwhile things to the original TR-606 concept, like the randomizing function, multiple outputs, a good preset system, host mode in which you can trigger patterns from your host sequencer, etc.
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In short, Nithonat is a great TR-606 emulation. With its additional instrument parameters it provides a wider range of sounds than the original machine. If you are looking for this type of drum machine, I donât think you can go wrong with Nithonat.