Check the preview (play) button in the bottom left corner of your Spectrasonics Instrument.
If the preview button is producing sound, make sure your midi controller and your DAW are set to send and receive MIDI on MIDI the same channel (example: MIDI channel 1).
If the preview button is not producing sound you'll need to check the size of your STEAM or SAGE folder to see if it's the correct size as below:
in STEAM or SAGE folder then compare it against the default sizes here:
If your instrument folder is smaller than the sizes listed above, and you are not using any custom or third-party patches or sounds, reinstall your instrument from the original installation media (discs, USB drives, downloads, etc.)
If you continue to receive error messages or have further problems loading sounds in your instrument, or if you would like to reinstall but are not sure how to back up saved, custom, or third-party patches and sounds, please contact Tech Support at email@example.com. Make sure to include the size of your STEAM folder as well as your current software and patch library versions when contacting support.