I have 'Use with Bluetooth output' enabled for the HiRes driver, I don't remember it making any difference, it's just been left like that (this may vary from phone to phone).
To get to Toneboosters EQ; from the library screen press the bar graph icon at the top of the screen and press Parametric EQ, I think you'll be prompted for an in-app purchase (I bought it a long while ago!)
To get to Toneboosters EQ; from the library screen press the bar graph icon at the top of the screen and press Parametric EQ, I think you'll be prompted for an in-app purchase (I bought it a long while ago!)