So... I came across a song with the following, rather unusual, situation.

4/4 measures filled with constant triplet 8th notes... but:
on the final measure of the riff, there's one additional 8th note (triplet timing).
It's not played faster as a quadruplet in the same measure or anything, it's actually another beat behind the measure.

My question: how do I correctly incorporate this in my time signatures?
It's not 1/8th because it's a triplet timing... so help!?

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