How can I adjust treble/bass/volume using dB values?

I have an App Designer app with three sliders that allow the user to input treble, bass and volume output values in dB. How could I implement this to affect the output of an audioplayer object as so:

[y,Fs] = audioplayer("filename.wav");

I have looked at the following link but am struggling to see how this fits in with the y and Fs values above.

https://uk.mathworks.com/matlabcentral/fileexchange/16568-bass-treble-shelving-filter

Can you help? Thanks in advance.