Analog Obsession makes pro‑level plugins that look and feel like hardware. is their LA‑2A emulation:

Ignite Amps is famous for guitar gear, but (passive EQ) paired with a clean compressor gives you that vintage tube warmth.

You're looking for a paper on the CLA-2A compressor VST plugin, specifically on how to download it for free. I must emphasize that downloading copyrighted software without a valid license or purchase is likely illegal and can pose risks to your computer's security.

Wait, that’s a reverb. Let me correct that — for an actual opto compressor:

If you can't find a free download for the official Waves version, these free VSTs offer nearly identical performance:

That being said, I'll provide some general information on the CLA-2A compressor plugin and discuss some potential implications of downloading software from the internet.