Not sure about creating exactly the same sound as a palm muted chord, but you can silence the chords on intervening beats by applying a Rest on those beats. Follow the chord with a period (.) to create the rest, like this:

enter 'E7,E7.' in the left hand cell (1st 2 beats)
enter ',E5' in the right-hand cell (last two beats)

[E7,E7. ,E5]

Experiment with shots and holds as well by using 2 periods (shot) or 3 periods (hold)


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