Buy a copy of Acid Pro, and you can make the cleanest clips around. They have a feature that is called "render looped region only". You strum a guitar for example for a few measures, and then set the loop region to loop perfectly for a bar. Then hit the render command and a prefect loop is made. Export that and import in RB, copy and paste to taste. Make one in each chord and you have the makings of a full pattern track.

It is good to have a full tool box of tools.

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