Import Model/s, clone & use outside function scope in Tick()

Questions
1

Hi, quite new to THREE.js, I want to bring in models, clone, modify positions & materials, and reference these objects outside to function scope for each import.

// Model Loading
    let device01 = null
    let device02 = null
    gltfLoader.load('device01.gltf',(deviceA) =>
    {  
        device01 = deviceA
        device01.scene.position.set(-2,0,0)
        scene.add(device01.scene)

        checkLoaded() })

    gltfLoader.load('device01.gltf',(deviceB) =>
    {   device02 = deviceB
        device02.scene.position.set(0,0.5,0)
        scene.add(device02.scene)
        checkLoaded() })
    const checkLoaded = () =>
    {   if(device01 && device02)
        {   console.log('dev1:', device01)
            console.log('dev2:',device02) } }

const tick = () => {  
   const elapsedTime = clock.getElapsedTime()
   device01.rotation.y = 0.4 * elapsedTime     *console error here**

Any help appreciated!