if you're trying to get to a point where you're focusing on the emptiness of your mind then it could be distracting.
I really dont know. Id say to mix it up OR w.e. is comfortable for you. I know thoae binural beats are supposed to help chakras etc. dependant on frequency. I am NOT sure if harm can be done from using them /how you use them (loud or just background noise etc). I think any type of meditation consistently will benefit rather than not.
Wish I couldve helped better. Ill have to look into it at some point. Im very curious.
Happy new year etc.:)