There are only two points within your Preview Range where you can assign your Current Time Indicator to be placed when you stop a Preview - (1) at the point in time where you initiated a Preview and (2) at the Preview Time Indicator. The Preview Time Indicator (PTI) is the thin, red vertical strip that travels along your Preview Range, to signify the frames being played. The PTI only appears during a Preview. You set the 'stop mode' for your previews in the Preview Panel — specifically, this setting is in last section of the Preview Panel. Take note that the settings for Start and Stop can be used independently of one another. IOW, you can initiate a Preview with Shift+Spacebar and stop the Preview with Spacebar. AE will then apply whichever settings you've set to these shortcuts. In short, to have your previews stop at the end of your Preview Range, you must initiate your previews when the Current Time Indicator is at the end of your Work Area, OR you perfectly time your preview stops when the PTI is at the end of the Work Area. With regards to your audio issue, head to Preferences>Previews and enable Mute Audio when Preview is not Realtime. Let us know if this fixes your problem.
... View more