I bought the fx8 unit and set it up with a Mesa single 50 watt rectifier. I started noticing I could only use multi delay delays and not regular delays with it peaking and making a loud obnoxious glitching sound that would continue until i disabled the delay so I used multi delays at a low mix percentage as it was the only way to avoid to stutter glitching sound. I didnt think too much of it...just thought it was a digital fx8 thing so I worked around it. Then I got a second amp a Marshall duel super lead and used the exact same setting and when I used the standard delays I never ran into these glitch issues. Any idea what's happening and how I fix this so my mesa doesn't do this?