Is the ADAV available to general users or is it restricted to volume users?
Since the ADAV400 is no longer available, this, unfortunately, becomes the only choice with in-built ADC and DAC.
It has the PWM outputs that enables connection the the popular PWN input amplifiers, and HP out. Moreover, it has slew RAM and hence the interest.
If, allowed, I would like to design a custom board with interface to a PIC microcontroller to build a tailor-made audio flow and try making some custom algorithms.
I will use the ADUSB1, purchased from DigiKey some time back.