Answered by Sayyidi al-Ḥabīb `Umar bin Hafīẓ (may Allāh preserve him and benefit us by him).
Some scholars mention that if someone remembers Allāh without being able to hear himself then these adhkār do not count, although he is rewarded for them. Please clarify this. Is it enough for us to move our tongues when reading the adhkār that you have given us even if we cannot hear ourselves?
This relates to adhkār which are either obligatory or recommended, such as the adhkār in the prayer. Someone must read these adhkār so that they can hear themselves in order for it to valid and to attain the reward. As for adhkār that someone reads outside the prayer and on their own, there is no need for them to hear themselves. In fact we hope that people reach a state in which the dhikr is so dominant that there are no longer letters associated with it and beyond that that the one remembering is no longer conscious of the fact that he is in remembrance because he is truly present with the One Being Remembered, exalted is He.