Zoom and Project scroll using knobs

Cubase
5

Here’s some working code for setting one knob to zoom and one knob to nudge (move project cursor) if it helps anyone in the future:

//-----------------------------------------------------------------------------
// 2. SURFACE LAYOUT - create control elements and midi bindings
//-----------------------------------------------------------------------------

// create control element representing your hardware's surface
var knob = deviceDriver.mSurface.makeKnob(0, 0, 1, 3)
var knob2 = deviceDriver.mSurface.makeKnob(3, 0, 1, 3)

// bind midi ports to surface elements
knob.mSurfaceValue.mMidiBinding.setInputPort(midiInput).bindToControlChange(0, 42).setTypeRelativeBinaryOffset();
knob2.mSurfaceValue.mMidiBinding.setInputPort(midiInput).bindToControlChange(0, 44).setTypeRelativeBinaryOffset();

//-----------------------------------------------------------------------------
// 3. HOST MAPPING - create mapping pages and host bindings
//-----------------------------------------------------------------------------
var page = deviceDriver.mMapping.makePage('Default')

// Nudge Knob
var nudgeLeftVariable = deviceDriver.mSurface.makeCustomValueVariable('NudgeLeft')
var nudgeRightVariable = deviceDriver.mSurface.makeCustomValueVariable('NudgeRight')

page.makeCommandBinding(nudgeLeftVariable, 'Transport', 'Nudge Cursor Left')
page.makeCommandBinding(nudgeRightVariable, 'Transport', 'Nudge Cursor Right')

createCommandKnob(knob, nudgeLeftVariable, nudgeRightVariable);

// Zoom knob
var zoomInVariable = deviceDriver.mSurface.makeCustomValueVariable('ZoomIn')
var zoomOutVariable = deviceDriver.mSurface.makeCustomValueVariable('ZoomOut')

page.makeCommandBinding(zoomInVariable, 'Zoom', 'Zoom In')
page.makeCommandBinding(zoomOutVariable, 'Zoom', 'Zoom Out')

createCommandKnob(knob2, zoomInVariable, zoomOutVariable);

/**
 * @param {MR_Knob} knob
 * @param {MR_SurfaceCustomValueVariable} commandIncrease
 * @param {MR_SurfaceCustomValueVariable} commandDecrease
 */

function createCommandKnob(knob, commandIncrease, commandDecrease) {
  knob.mSurfaceValue.mOnProcessValueChange = function(activeDevice, value) {
    if(value === 0 ) {
      commandIncrease.setProcessValue(activeDevice, 1)
    } else if (value === 1) {
      commandDecrease.setProcessValue(activeDevice, 1)
    }
  }
}
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