Tested version v0.4.1.

• Pressing F8 does not stop playing anymore (F6 starts and stops playing)
• Pressing space do not start/stop playing if certain UI buttons are selected, instead it "clicks" the UI button

For example if I have just added (or removed) a track. The corresponding button is focused and pressing space presses the focused button (for example the plus sign and adds a new track).

In the screenshot below I have added a track and then tried to start playback by pressing space. Instead a new track is added every time space is pressed.