Hello sir!
Any updates on the production status of this shield? I am an audio engineer currently working on a project that requires HQ (16-bit, 44.1kHz, uncompressed PCM) audio playback in order to illicit an otoacoustic emission by way of a small, standalone device. (Basically, it's a box with a big button that says "Do not press this button." Activation will play back a sound I've engineered to feel as if it is happening "inside" your head.)
Blessings,
Richard