Though powerful for its size, like all other grooveboxes and workstations, your Woovebox does has a finite amount of Digital Signal Processing (DSP) resources for simultaneous real-time synthesis, effects and sample playback. Please note that rendering a song or its individual stems to a WAV file via Wooveconnect, is not subject to any DSP resource limitations.
In general you should be able to play moderately complex sounds and effects on Track Cd through to A5 simultaneously without running into serious limitations. As such, you should not need to worry for even moderately complex songs. To use more tracks simultaneously however, it is important to understand DSP resource management.