I have had this problem as well.
In fact, it makes it nigh impossible to do much with the guild. I have played some PVE with many guildies, but when it comes to endgame content, or AvA, RC and a Mac do NOT peacefully coexist.
So my question is, what are my options?
I understand that RC is pretty much PC only. I cannot buy a separate PC just to run RC at this time.
I also understand that other forms of communication (Mumble, Ventrilo, Teamspeak) are either in use exclusively by the leadership, or have other limitations ($$$).
This is becoming a limitation for me with respect to doing more with Gaiscioch. I enjoy the guild but am challenged by the feeling that I need to get in RC to really get to know anyone very well.
I suggest that, at a time when the guild is trying to grow, perhaps we could consider a more mainstream and modern voice system for general membership.