[SOLVED ]Use one fader to dynamically control other faders by changing parameter numbers

General discussion
1

Hi,

I am trying to implement a “smart” fader which can control several other faders, one at a time.
for this I try to update the smart fader’s parameter number to match the one of the target fader to control.
I have a button that changes the parameter number of the smart fader to address two target faders for a start.

Now I fail to understand the value states and how UI reflects them:

  1. when the smart fader is switched to a new target fader, UI still has it’s previous value, leading to jumpy values in the target fader, when moving the smart one.
    2.my debug output though shows that values seem to have updated correctly after the call to setParameterNumber()
  2. trying to update the smart value manually to match the new target with setValue() or parameterMap.set() seems to have no effect

Does anyone have a clue how to make that work or what the underlying issue is?

Find a example template here

and the code


function toggleSmart(valueObject, value)
    local faderAId = 2
    local faderAParameterId = 50
    
    local faderBId = 3
    local faderBParameterId = 100

    local faderSmartId = 1
    local smartFader = controls.get(faderSmartId)
    
    if(value == 1) then    
        print("switching to: A")
        local fader = controls.get(faderAId)
        local targetValue = fader:getValue():getMessage():getValue()
        
        
        smartFader:setName("Control A")        
        print("Value of A: " .. targetValue)
        print("smart value BEFORE param update: " .. smartFader:getValue():getMessage():getValue() )
        print("smart param BEFORE param update: " .. smartFader:getValue():getMessage():getParameterNumber())

        smartFader:getValue():getMessage():setParameterNumber(faderAParameterId)
        print("smart value AFTER param update: " .. smartFader:getValue():getMessage():getValue() )
        print("smart param AFTER param update: " .. smartFader:getValue():getMessage():getParameterNumber())
        -- E1 does not reflect this value change


        -- trying to update manually, no effect from these calls
        --parameterMap.set(1, PT_CC7, faderAParameterId, targetValue)
        --smartFader:getValue():getMessage():setValue(targetValue)
        print(" ")
     else
        print("switching to: B")
        local fader = controls.get(faderBId)
        local targetValue = fader:getValue():getMessage():getValue()
        
        smartFader:setName("Control B")        
        print("Value of B: " .. targetValue)
        print("smart value BEFORE param update: " .. smartFader:getValue():getMessage():getValue() )
        print("smart param BEFORE param update: " .. smartFader:getValue():getMessage():getParameterNumber())

        smartFader:getValue():getMessage():setParameterNumber(faderBParameterId)
        print("smart value AFTER param update: " .. smartFader:getValue():getMessage():getValue() )
        print("smart param AFTER param update: " .. smartFader:getValue():getMessage():getParameterNumber())
        -- E1 does not reflect this value change

        -- trying to update manually, no effect from these calls
        --parameterMap.set(1, PT_CC7, faderBParameterId, targetValue)
        --smartFader:getValue():getMessage():setValue(targetValue)
        print(" ")
    end
end
Dynamically changing target (parameter number) of a control?
2

Update from debugging:

  • looks like any of the respective controls sharing one param number needs to receive a value update to make UI reflect a change
  • applying the current value again does not seem to trigger
3

SOLVED: it needed a call to parameterMap.apply() to make the UI reflect the change
I found this by RTFM regarding the parameter map

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