Live midi "pop" issues not resolved by buffering

Try as I might, I can't seem to remove a pop sound from a midi signal in one of my songs. I've done the google thing in the process of troubleshooting this issue, and taken those suggestions: increase buffer, update the driver for my Saffire 14, and adjusted the LFO from "the extreme ends" and had no luck. It's happening on Ableton Live using a Macbook Pro that has it's RAM maxed out at 16. If anybody has another suggestion, I would greatly appreciate it. An example is in my signature, and it happens all throughout the french horn in the first minute of the song. You can hear it at 1:08. It's annoying, but not detrimental...