Nope. There is the suggested method by Master Chin Kung.http://www.amtbweb.org/tenrecitationmethod.html
And chant with a pure mind and body will experience greater results in short time...by pure mind I mean we should not let the mind engage in greed, anger, and ignorance...if there is greed, practice letting go of it. if there is anger, understand why there is anger-generally it has to do with the way we think or how we see ourselves, others, expectations of ourselves and others. And ignorance means we are so deluded with the way we see and do things and without knowing that there are flaws in what we think and do things. As you can see, our mind is always engaged by greed, anger, and ignorance...in other words selfish. If we use this unpure mind to recite Amitabha, the results will not be as good.
By pure body, I mean not engaging in stealing, killing, hurting, and sexual misconducts (married but cheating for example).
As for speech, don't engage in gossips, or speech that can hurt others, let alone creating conflicts amongst groups through speech. So be mindful.
Figuratively speaking, when one decides to recite Amitabha, he/she is reciting the way of Buddhas. Buddhas are peace, selfless, and compassionate. So we have to also practice their way. So reciting Buddha means we are not reciting the 3 karma of body, speech, and mind.