No sound in one file but sound in other files

Dorico
1

Yesterday when I was following the excellent video on Easy Lead Sheets I could hear the sound, but when I opened it today to continue the lesson, I don’t hear any sound (starting in measure 5 where there are notes. I can hear sound in other files. Even though the Lead Sheet video is for Dorico SE, I am using Dorico Pro 6.2.30.6245. I’ve attached two files: Dorico SE Lead Sheet and Learn in string trio.

Learn in string trio.dorico (1.4 MB)

Dorico SE Lead Sheet.dorico (1.6 MB)

2

The voice is muted in the mixer. Press the solo button to unsolo the Dorico Beep.

Jesper

Dorico SE Lead Sheet.dorico (1.6 MB)

Play mode:

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3

Once again, my Dorico friends come through right away with the answer. Thanks!