NEW: browser based adb tool https://powerampapp.com/webadb/ This one doesn't require installation or even can be used on the Android devices in mobile Chrome.   The Poweramp Equaliser app is designed to operate with other Android audio apps which already specifically allow external modification of their sound output - and you can see and enable those apps in the 'Known Players' list in Settings - but there are some other audio playing apps which don't provide access for this sort of