Arturia MatrixBrute User Manual page 13

Part of the beauty of analog synths like the MatrixBrute is that the voltage
running through their circuitry drifts a small amount, giving them a slightly
random character. It also takes a while for the voltage to stabilize when you first
turn the synth on; the warmer the temperature, the shorter the time it takes, but
you'll still need to auto-tune the instrument from time to time.
Hold down Kbd Track and Panel to initiate the auto-tuning process.
Understanding Digitally-Controlled Analog
Summary: The knobs and sliders don't necessarily reflect the underlying
settings. There are some different behavior settings in the MIDI Control Center
software, but in the default mode you must sweep the knob past its actual
setting to "hook" it.
Unlike early analog synths, MatrixBrute has the advantage of digital control
over its analog circuitry. It's the best of both worlds: the warmth and hands-on
control of real analog, with the ability to save and recall patches and settings
- to say nothing of the Matrix (electronic patchbay), MIDI, and other modern
conveniences.
Because of that, the instrument's knobs and sliders aren't actually controlling
voltages directly, they are knobs that instruct the digital circuitry how to control
the analog voltages. So the positions you see on the panel don't necessarily
reflect where they're really set, for example after you load a Preset sound.
The MIDI Control Center software has three modes. In Hook mode you must
sweep the knob until it catches its actual position before it has any effect. Jump
mode means the voltage jumps to the knob position as soon as you move it; and
Scaled mode scales the range of the knob based on the stored value and the
physical distance to either extreme.
The Panel button mentioned above will bypass the current preset and give you
a sound that is based on the actual positions of the knobs and sliders.
Load a Preset, Play, and Adjust the Output Level
Arturia - MatrixBrute Manual - Getting Started with MatrixBrute 7