I use one of those android apps. The crickets, fire, water settings usually hit my spot. After 30 minutes the single tone has dissolved and I get a fainter dual oscillator tinnitus. I practice finding quieter tones deeper in the sound field. This weakens the primary tones.

Tinnitus is a mental process, but you can't work with it using thought or direct attention. It requires shifting lower more subtle processes. It's a form of meditation