Hello, I recently made a dramatic change to my gear. I updated my desktop pc to MacBook Pro and soon later I purchased new interface - UAD Apollo Twin Solo. My old setup was a self build PC running Windows 7 and Reaper as DAW with M-Audio ProFire 2626 FW interface - this line served me perfectly for several years until processor and memory started to run too short for album recordings. Then came Apple... and problems... I first did some demo recordings using my MacBook Pro and ProFire 2626 with Thunderbolt > FW adapter. Loyal Reaper as DAW. Immediately terrible latency occurs when I played guitar. It sounded like there was a reverb effect on the guitar, it was not dry at all. I was able to fix the latency down with my friend when we discovered some overlap with output- channeling. Still the latency was too bad to play anything in time - I found out that many Thunderbold / FW adapter users shared the same problem... So I saved some money for UAD interface, hoping the pure thunderbolt interface to take away the latency issues. UAD Apollo Twin Solo arrived and major latency issues gone with it, but still some remaining. Still having problems recording anything in time. I have no idea where the problem is - I am hoping to find someone to assist me with this problem... Hope someone can help me out. I am using: MacBook Pro 15" retina early 2013 OS X 10.9.4 UAD Apollo Twin Solo Reaper v.4.581 Here is the picture of UAD Console (if it helps): https://www.dropbox.com/s/4dl4laebm35mwen/Screenshot 2014-08-05 19.52.07.png Thanks!