Yes, there is a sort of "memory bank" in our brains. When we speak or recall auditory experiences, we're pulling from a vast store of information. This isn't just limited to the words and sounds we know, but also the motor commands required to articulate them. However, the exact location and structure of this storage is complex and not fully understood. It's a testament to the incredible capabilities of the human brain that we can recall and use this information so fluidly and quickly, even when it doesn't feel like we're consciously pulling from memory.