Donkey Kong Country Aquatic Ambience theme: one voice unexpectedly slides down

[yv2149]

Hi,

While converting Donkey Kong Country Aquatic Ambiance tune, a voice is unexpectedly sliding downwards.
On converted IT file, one can hear it at time offset 00:17:712ms (near end of IT pattern 8).

Source file is here:
aquatic.zip

Audacious / audacity and friends are playing the SPC file correctly.

Thanks for any feedback!

[Xkoop7321]

I actually have a similar problem, just that all of the pattern slides around. Its a thing called Portamento Glide. But idk how to disable it.