/setOffsetInBank 4  // as it starts with 0, we use 4 for "channel" 5
/2/width x  // your float value from 0 - 1 for width

function onValueChanged(key)
  
  -- we have to switch the bus and offset only if the radial was touched 
  if key == "touch" then
  
    -- just to make sure we switch to input bus on page 2 ("simple" OSCmessage)
    sendOSC('/2/busInput', 1)
    
    -- "complex" OSCmessage (see TouchOSC scripting API)
    sendOSC(
      {
      -- our path to set the channel directly in page 2
      '/setOffsetInBank', 
        {
          -- converts the string tag property of our radial to float32
          {tag = 'f', value = self.properties.tag}    
        }
      }
    )
  end
  
  -- now, we send the value of our radial to TM...
  if key == "x" then        
    sendOSC('/2/width', self.values[key])    
  end
  
end