@pelwell
in 4.19.y latest drivers 192k sample rate files are some time not playing properly.
we analyzed the code and noticed that mclk_div condition not satisfying in new driver.
refer previously working driver
https://github.com/raspberrypi/linux/blob/rpi-4.14.y/sound/soc/bcm/allo-digione.c
lines 111- 113 : AlloDigiOne working always mclk_div = WM8804_MCLKDIV_256FS;

On latest driver can you please add the condition for AlloDigiOne to configure only WM8804_MCLKDIV_256FS
https://github.com/raspberrypi/linux/blob/rpi-4.19.y/sound/soc/bcm/rpi-wm8804-soundcard.c
line 97 to 103