RAM rendering slowly was from rendering a 1080 video instead of 720.
The real issue is the audio echoing during RAM preview, it doesn't happen in any previous videos. Making a new composition doesn't help, but the source video has no echoing and the rendered video also has no echoing -- it's just in the RAM preview. I can work around it for the most part but it's really annoying.
Can we see screenshots of your audio hardware preferences?
Also, what, exact, version number of AE is it?
What happens if you reboot, open After Effects ONLY, and try to do the preview? (Chrome has gotten very bloated lately and has been known to cause odd issues sometimes if it's open.)
Hi AE Hates Me,
Sorry for this issue. Did you ever find a solution? Please let us know if you have or if you still need help.