The request appears to reference a specific software version, by Reason Studios , which was a significant update that introduced VST3 support to the DAW.

Action: Combine a classic Reason synth (like Thor) with a third-party effect (now supported in 12.5) to create a custom hybrid sound.

While I cannot "generate a piece" of music directly as an audio file, I can help you using the specific features found in Reason 12.5.0. Recommended Setup for a New Piece (Reason 12.5)