The TTS-1 soft synth is a DXi instrument, not a VSTi instrument. Unlike VSti, the DXi location is entered into the Windows operating system registry so a program doesn't have to search for it, all Windows programs know it exists.

Open Preferences by pressing Ctrl+E then select the MIDI DRIVERS button.

When you click on the VSTi / DXi button you should see a list of sound modules that include TTS-1. If not, then your Cakewalk installation is faulty.

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Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
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