What are the biggest differences between this and the free version?

Hi! the core idea is the same but this version has lots of new features:

• new modulators: Audio Input/Output
• ADSR controls for shaping grain envelopes
• Synchronize time based parameters to host tempo/beat
• Built-in preset manager (and a couple of factory presets)
• Position knob to control gain start position
• Collapsible UI sections to save screen space

ADSR for me is a must have. Tempo syncing is also a great function.