Leaving the recitation machine on at night is a good thing. It will continue to plant recitation seeds in your psyche. Of course they are not the same because while you are awake, the recitation seeds have more samadhi power by nature.
The more you recite the Buddha’s name, the more rebirth blessings you have.
The key is not necessarily the quantity but quality of your recitation. Therefore, when you concentrate more on your recitation, the rebirth blessings are far greater. This is why, when we train our students on the Pure Land Dharma Door, we stress developing the Buddha recitation samadhi through the proper technique.
Instead of consulting the various resources indiscriminately, you should instead pick and choose the proper Pure Land authority. I personally would not waste time with materials unless it is from a Buddhist Patriarch.
For example, your CD source regarding the yin being is totally wrong. I would discard all materials from such a source.