@Michael I’m redirecting to this thread. 
Linking from the below because this isn’t really relevant to that guide any more.
My build chain
Here is the guide I’m following.
I have had to swap to a different SD card library since the code above no longer works.
Here is the wrapper around the guide above.
### THIS NEEDS TO BE A CLASS
from wavplayer import WavPlayer
import os
from machine import Pin, SPI, I2S
import sdcard
def play():
wp.play("hello.wav", loop=True)
return is_playing()
def pause():
wp.pause()
def resume():
wp.resume()
def is_playing():
return wp.isplaying()
# ======= SD CARD CONFIGURATION =======
#sd = SDCard(slot=1, sck=Pin(6), mosi=Pin(3), miso=Pin(4), cs=Pin(29))
sd_pin = Pin(29)
sd_spi = SPI(0)
sd = sdcard.SDCard(sd_spi, sd_pin)
os.mount(sd, "/sd")
# Read files from SD card
print("my list:")
for filename in os.listdir("/sd"):
print(filename)
# Init Audio
'''
A1 - This is used for audio data, or DAT.
A2 - This is used for wordselect clock, or LR.
A3 - This is used for bitclock, or BCLK.
'''
audio_clk_pin = Pin(26)
audio_word_pin = Pin(27)
audio_data_pin = Pin(28)
#Construct the wp
wp = WavPlayer(id=0, sck_pin=Pin(audio_clk_pin), ws_pin=Pin(audio_word_pin), sd_pin=Pin(audio_data_pin), ibuf=44100)
Here is the offending code.
play() #<----
while is_playing():
if button.is_pressed:
pause()
Goal
It’s all feeling like I’m on the wrong path entirely in terms of my build chain.
I will entertaining loading from SD onto flash first and reading from flash.
Nothing here is real time. 99% of the time this chip will be idle so I have plenty of time of read-write blocking code.
Thanks.
Pix 
