Update file names and content to match Meter -> Time Signature in v7

content/editing-sessions/setting-up-time-signature/index.en.md

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+title = "Setting up time signature"
+chapter = false
+weight = 3
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+
+The _time signature_ determines the musical speed of the passage we are 
+composing and is measured in _beats per bars_.
+
+If we are composing something rhythmic, it will also determine the lengths of
+the sound samples we use to some extent. So it is important to be able to set
+up the time signature before we continue.
+
+To see the time-signature-related timelines for the session, you can
+right-click anywhere in the "header" of the rulers and check the following
+options: _Time Signature_, _Bars & Beats_, and _Tempo_.
+
+{{< figure src="en/ardour7-ts-timeline.png" alt="Time signature">}}
+
+There is always at least one marker for both the time signature and the tempo 
+in the session, right in the beginning of the timeline. You can change either
+of the two further in the session. To do that, you need to pick either time
+or bar and beat on the timeline, right-click on the dedicated timeline lane,
+choose _New Time Signature_ or _New Tempo_, and provide a new value in the
+newly opened dialog.
+
+{{< figure src="en/ardour7-new-time-signature.png" alt="New Time Signature" >}}
+
+You can also easily change the latest time signature or tempo even if you 
+scrolled past the point in time where you can see the marker on the timeline. 
+Simply click on either tempo or TS button right below the secondary clock and 
+provide a new value in the newly opened dialog.
+
+{{< figure src="en/Ardour5_Edit_TS_and_Tempo.png" alt="Tempo and Time Signature" >}}
+
+For the tempo (button on the left), choose the number of beats per minute (bpm)
+for your session.
+
+For the _time signature_ (button with "TS" caption on the right), you can 
+enter new values for the _beats per bar_ as well as the _note value_.
+
+## Continuing
+
+Next, we will explore using ranges to set up a loop we can listen to while we
+arrange the rhythm.
+
+Next: [USING RANGES](../using-ranges)