Upvote:0
Chanting is incredibly common in Theravada Buddhism. I'm not sure exactly what would count as "chanting mantras," however. Mantra meditation is common, but it's usually silent.
There are no "secret" procedures in Theravada. Monks aren't allowed to disclose certain things to lay people, but there wouldn't be any secret meditation techniques or chants.
There are some monks such as Ajahn Suchart who see chanting as beginner's level meditation. The same would not apply to mantras, however.
Upvote:2
In Burmese flavour of Theravada Buddhism, mantras as Sacred utterance with Magical Powers, although believed and practised by many, are not the core part of the teachings. But if you mean mantras as mental notes or chants - they are commonly used to build concentration and the same goes for the prayer beads.
There are no secret teachings in Theravada Buddhism, any teachings that are not aligned with The Pali Cannon are regarded as non-Theravadan.
Upvote:5
There is chanting of Pirith. This is not done as a meditation but sometimes advocated to be done when sloth and torpor is preventing you from meditating to raise energy levels. So in a way it can be used as part of your meditation sitting through not exclusively doing this but use it when needed to progress your meditation siting.