Fixes a bug related to stopping transport. The granular module is synced to the beat. When transport was stopped at exactly a beat, it previously kept firing grains (since we land on the beat transition continuously). Since there is a limited number of grains in the pool, this in turn leads to them all being occupied. As a result, when playback is resumed, few grains are available for playback. Instead, now, when playback is stopped, the plugin switched to its own internal clock for maintaining synchronization. Thanks a lot for the bug report Someone65! Very helpful!