Hi @tacmonkey - I had a similar issue trying to capture audio with my m5stick. I had success using: SD = 34 WS = 0 SCKJ = -1 The clock listed as pin 0 on the sticker on the back of the M5 Stick seems to actually relate to the word select clock. The code I was using required a value to be assigned for the SCKJ so I just set it to -1 to pass through an undefined pin value and this worked. I don't know if this would work in your particular situation but thought it worth passing on because it worked for me.