Different sound effects

Hi! I've been maining hh in Wilds and it has been only one thing that I haven't figured out yet.

So, I already know that there are 3 different melody sound effects for each horn (R2, R2+∆ and R2+O). It is a shame that they can't be chained but that is not the question.

I have noticed that there are 2 versions of each of these melodies, for example, G.Arkveld horn melodies can sometimes be heard with an extra low piched bell.

I have been trying to hold some buttons but while it seems that it works sometimes it also looks like is totally random. Is there any mean to perform that version of the melody intentionally?