This is what technical support told me:
The Analog Rytm MKI/MKII has a bit more noise in its output signal than a digital device or a VST, and there are several reasons for this:
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If you set the master volume to max, the output of the Analog Rytm is really hot, so the noise seems more prominent than on many other devices when you turn up the volume.
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The Analog Rytm has eight separate analog voices that are mixed to a single output (unless you use the separate outputs, of course). It is the same as having eight separate analog synths connected on separate channels in a mixer. Every synth (voice) produces a small amount of noise, but they are all added together.
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Each of the Analog Rytm’s eight voices goes through several analog components and processes that all add a small amount of noise:
• An analog mixing stage
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An analog distortion
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An analog compressor
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An analog overdrive
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An analog volume pot
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An analog output mixer
Here’ss what you can do to keep the noise as low as possible:
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Turn the mix of the compressor down if you don’t use it in the sound design.
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Turn down the distortion and overdrive if you don’t use it in the sound design.
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Good practice for lowering noise is to make sure that each track has the amp set to a decaying value instead of the default INF. While each drum has its separate envelope that closes the analog voice, the VCA is still fully open. To make sure the track VCA is always closing, go to the AMP page of each track and change the decay value to anything lower than INF. (127). You need to re-trigger each track for the decay value change to take effect.
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Use an external noise gate.