Hello,
To adjust the ADAU1401 / 1701 sample rate requires two settings -- the one on top of the schematic screen and another setting inside the Hardware Configuration / 170x \ 140x Register Control screen. The latter setting has the DSP running a reduced number of program instructions per sample, effectively enabling it to handle more samples per second at a constant computing power (about 50 million instructions per second). A complete description of what you need to do is at: FAQ: How do I change the sample rate of my SigmaStudio system?
The changed setting is shown below, and the modified file is attached.
Please try this out. If it still doesn't work I can experiment with it on a -1401 eval board (which is presently at my work location).
Best regards,
Bob