Speaking of set up of Apple devices: treble and bass adjustments?

[DeusxMac]

August West wrote:
IIRC, I used an Ambrosia Rogue Amoeba product at one point. Take a look at Soundsource and the ability to insert effects

I’m looking for something that can alter output dynamically in real time*. An after-download, post-processing app doesn’t fill the bill (and Soundsource doesn’t appear to be something that can be used on an iPhone).

*Examples: streaming a movie from Netflix, watching live feed of a sports event, or listening to music via YouTube on my iPhone.