Your metal experiences (thoughts, memories, emotions, etc) create sensations. You should use it to reduce your unwholesome roots. Even visualisation is a function of the mind.
LATENT TENDENCIES ARISING THROUGH THE MIND. Bhikshus, dependent on mind and mind-objects, eye-consciousness arises.
When the three meet, there is contact. Dependent on contact, there is what is
felt as pleasant, or as painful, or as neither pleasant nor painful.
When one is touched by a pleasant feeling, one delights in it, welcomes it, remains attached to it. Thus one’s latent tendency of lust (rāgânusaya)
When one is touched by a painful feeling, one sorrows, grieves, laments, beats one’s breast and falls into confusion. Thus one’s latent tendency of aversion (paṭighânusaya) lies latent.
When one is touched by a feeling that is neither pleasant nor painful, one does not understand it as it really is, the arising, the passing away, the gratification, the danger, and the escape with regards to that feeling. Thus one’s latent tendency of ignorance (avijjā’nusaya) lies latent.
Bhikshus, that one could make an end of suffering here and now, without abandoning lust for pleasurable feelings, without removing aversion towards painful feelings,
without uprooting ignorance towards feelings that are neither pleasant nor painful this is impossible.
Abandoning the latent tendencies
ABANDONING LATENT TENDENCIES ARISING THROUGH THE MIND.
Bhikshus, that one could make an end of suffering here and now,
having abandoned lust for pleasurable feelings,
having removed aversion towards painful feelings,
having uprooted ignorance towards feelings that are neither pleasant nor painful this is possible.
Cha Chakka Sutta
When you are mindful about the body you experience the Mahābhūta through these have an impact on if it is pleasurable or not. Dhātu Vibhaṅga Sutta, Titth’ayatana Sutta and other similar suttas analyse this aspect in the section about the 6 elements (bodily aspect) as well as the mental aspect under the section on 18 mental examination (metal aspect - including visualisation).