Thank you Frank B for your help . I wish in future Teensy will have 48kHz 24bit, this would solve the problem with usb (audio) in/out for Macintosh computers .
It might be worth pointing out that the T4 and even 3.6 are more than capable of processing 24 or 32 bit audio and higher sampling rates. For example you can look at the Tympan code here: https://github.com/Tympan/Tympan_Library/