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Continued follow-up, it works! I foolishly also flipped the collector and emitter on MOSFET Q1 in the schematic, but was able to whitewire a fix. In hopes of contributing back to the community, below are images of the project and some lessons learned along the way! The final product. I work...

This is so embarassing... The culprit is... Insufficient soldering at the QFN20! Such a rookie mistake and I can't believe I missed it, even under microscope. I have many things to tidy up but it should be downhill from here! Thank you again PJRC contributors for all the amazing...

Thanks! Is the recommendation to redo the layout with 0603 decoupling caps and move them closer? Before I go that far, is there an equivalent of a *IDN? to see if the SGTL5000 is able to communicate at all? Noted about the trace widths and pad vias. I tried to shave every 0.010" off any...

Hmm, just saw the note "Wires for MCLK, BCLK, LRCLK, TX & RX should be kept short. The audio shield is meant to connect to Teensy through short pins. Wires can be used, but wires must be short to avoid problems." Per the attached PCB layout, is it something I should mostly be ok with?

Hello! Hobbyist here slowly going crazy to figure this out... I'm running out of ideas and wanted to post this in hopes of getting some additional thoughts on this as I'm not sure how else to best move forward. Pardon any mis-wordings below -- EE and software is not my primary background...