Notching/Masking App That Allows to Notch an Entire Range of Frequencies?

I have tried several notching/masking apps to use on my phone with my earbuds. Every one of the apps I've used allows you to pick specific frequencies (e.g. 7,250 Hz, etc).

I need an app that allows you to notch an entire range of frequencies. For example, notching from 5,000Hz to 7,000 Hz (thereby notching everything between 5,000-7,000).

Does such an app exist? To date, notching/masking apps do almost nothing for me because it would next to impossible for me to notch my tinnitus since it's comprised of hundreds of frequencies.