Investigation of the Effectiveness of Sound Enrichment in the Treatment of Tinnitus Due to Hearing Loss

Apologies in advance because I didn't read the study, but how/why is this any different than every other sound therapy that has been offered for the last 30 years?
I haven't read previous sound therapy studies, but the placebo in this study is remarkably well-designed.

They used narrow bands of sound frequencies that did not overlap with the patients' hearing loss or tinnitus frequencies, and the placebo group showed no improvement. In contrast, the treatment group, which received overlapping narrowband frequencies, experienced significant improvement.

Some questions remain unaddressed in the paper:
  • Hearing loss between 45-55 dB was a criterion. Do people with less hearing loss, no hearing loss, hidden hearing loss, or very high-frequency hearing loss also benefit?
  • The study statistics show that tinnitus frequency is tightly clustered around 6.2 kHz. Many of us have high-frequency tinnitus, so we still don't know how effective this approach is for high-frequency tinnitus.
I also read that earlier sound therapy devices were effective mainly for single-tone, low- to mid-frequency tinnitus. So, the findings of this study may not be groundbreaking for these types of tinnitus.

My tinnitus is a high-frequency noise.

Could you recommend any software (preferably simple to use) that can create a narrow band of noise around 13-16 kHz?

The options I've come across either don't cover the full spectrum of frequencies or only allow selection of a single tone frequency at a time. Others provide a noise option but without a customizable range (e.g., a continuous spectrum like 12 kHz - 14 kHz - 16 kHz).
 
but how/why is this any different than every other sound therapy that has been offered for the last 30 years?
The results are remarkable, though the eligibility criteria for participants are more restrictive than in most trials. Taken at face value, the results suggest that the treatment is highly effective.
 

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