I must have missed the circles the first time around…
That does look like a sharp high cut filter, I honestly could not recommend utilising such a steep filter. 24 dB is maximum on a master bus but probably 6 dB or 12 dB will sound the best.
The phase-shift and transient smearing starts to get noticeable above these slopes.
Also, do not forget for a 44.1 sample rate file we have the Nyquist anti-aliasing filter at 22.1 KHz.