All playback commands are found on the blue playback bar at the bottom margin of the window. Voice filter, solo button and tempo control are there as well. The keyboard shortcut [Strg]+[space] works as on/off switch for playback.
Temporal position display: Playback has a temporal position display which shows the entire length including all repetitions and which is linked to the playback cursor. This way you can easily navigate to any spot in the score.
To the right of the solo button you will find the voice filter for playback. Here you can assign a volume to each voice. During playback you can fine tune and when you're done take over the values to the SystemTemplate with one mouseclick.