Whether you need the Free or Pro version of Surroundizer—a legacy spatial audio VST plugin developed by AcousModules—depends entirely on the number of channels your project requires and whether you need stereo input processing.
The critical differentiator is channel routing capability and hardware configuration limitations. Feature Comparison Free Version Pro (Commercial) Version Input Routing Mono only (1 channel input) Stereo (2 channel input) Output Routing Limited to Quadraphonic/4.0 Up to 7.1 and 8.0 Octophony Spatialization Sections Basic LCRS / Cinetic Full Cinetic, Spectral, & LCRS Target Audience Hobbyists & beginners Advanced surround multi-channel mixing Which Version Do You Need? Choose the Free Version if:
You are mixing in Quad (4.0): If your audio monitoring environment or project only requires 4-channel surround sound output, the free tier covers basic panning.
You work primarily with Mono sources: If you are trying to take single-track vocals, mono instruments, or basic spot effects and throw them into a multi-channel environment, the mono-input limitation won’t hinder your workflow.
You are just learning spatial audio: It acts as an excellent, zero-cost sandbox to understand 2D coordinate sound fields and track envelopes before investing money. Choose the Pro Version if:
You need full 5.1, 7.1, or 8.0 outputs: If you are mixing for modern home theater configurations, film, or complex avant-garde 8.0 octophonic speaker arrays, you require the Pro version to unlock those channels.
You want to upmix true Stereo tracks: The Free version bottlenecks stereo signals. If you need to map complex stereo panning across an entire room while maintaining phase coherence, Pro is a requirement.
You need advanced Spectral processing: The Pro version divides input signals across four customizable frequency bands via crossover filters, allowing you to throw high frequencies to the front and low frequencies to the rear automatically.
If you plan to use this plugin for multi-channel mixing, what speaker setup (e.g., 5.1, 7.1) or DAW are you using? I can help you figure out how to configure your track routing.
Free vs. Paid Software: Which One Should You Choose? | by Luffy
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