Hover your mouse over the pulsing icons to view info on the relevant controls

Hand Position
Selects the dominant hand position - notes will play in ather hand positions only if they do not occur in the selected position
Preset Menu
Load factory presets or save and load you own custom presets
Dominant Finger
Select your dominant finger - if a sample is recorded with this selection it will play, else the index finger will persist. Playing fast notes will also alternate between index and middle finger
Velocity Curve
This will adjust the input velocity curve - setting it low will adjust the input velocity along a lower curve producing move softer notes - setting it to a higher curve will produce louder notes
Release Samples
Adjust the volume of the release samples
Ambient Room Tone
Adjust the volume of the ambient room tone
Sustain Pedal - engages slide keyswitch.
Movement Sounds
Adjust the volume of the movement sounds for added realism
Navigation Menu
Mix - displays settings for mic channels
FX - displays setting for adjusting effects
Performance settings
Adjusts the performance of the upright bass allowing you to made performance choises. - see Performance buttons menu
Keyswitches
Keyswitches allow you to select the desired articulation.
Sustain Notes
Slide - Slide to the next note of play half note slide in if no other notes are held. Sustain Pedal Activare the slide kewswitch too
Hammer on \ Pull offs
Fall
Soft Notes / Double Stops
Harmonics
Channel Outputs
Stereo (Default Setting) - All channels are routed to the main Kontakt stereo out
Multi Channel - Channels are routed to individual Kontakt channels - This requires individual Kontakt output channels to be created so that your DAW can use them as inputs

Slide Speed
The pitch bend wheel controls slide speed, with three settings:
Center (default): Quarter-note slide
Up: Eighth-note slide
Down: Whole-note slide
Fall Speed
For falls, the pitch bend has two settings:
Center (default): Natural speed
Up: Faster fall

Mute Channel
Mute channel from current mix - Track remains active and will consume CPU
Solo Channel
Will mute all channels except the solo'ed channel
Channel Volume
Adjust the mic channel volume for your preferred mix
Mix Positions
There are 4 main mic positions
DI - Placed under the bridge Super close, clean, modern tone
Close Position
Close M (Mono) - A blend of a x and x mic -
Close ST (Stereo) - 2 DPA xxx mixs placed 1.5mete apart
Mid Position
X mic at 2.5 meters
Room Position
Room M - Rode x mix at 5 meters
Room ST - Mid\Side
Purge Samples
You can use these buttons to purge the samples of the channels you are not using. This will help with RAM usage and over all performance.

Compression
Add compression to the main signal
Verb
Add reverb to your main signal
SUB
Boosts subsonic frequencies for added bass
Tone
Light - Subtle boost high frequencies for added bite
Dark - Subtle cut in hight frequencies for darker tone
Dirt
Add distortion for main your main signal

Open Strings
Play open strings when possible - this will overide the hand position when an open string is played
Follow - Hand Position
Hand position will automatically adjust based on the note played - this gives a more natural playing tonality when moving up and down the finger board
Keyboard Mode
Allows for full keyboard style chords to be played overriding the natural single note per bass string performance
Vibrato On/Off
Natural vibrato can be controlled with the mod wheel or the vibrato switch - You can also automate vibrato by controlling this switch
To create multiple output channels in Kontakt

Select Engine Outputs
Stereo Output - All audio channels are routed out of Kontakt Stereo Out - The Mix created in the mixer is retained.
Mulit-channel Output - All channels are routed out of Kontakt ch 1-6 - The WLKR mixer is bypassed in this mode. In Kontakt go to View -> Outputs and creat 6 individual stereo outputs.