Imagine that the Orisa exist on a frequency and tuning into that frequency is similar to tuning into a radio station that has a specific number on the dial.
To tune in to the frequency of the Orisa, is just like tuning into a radio station, you have to be able to adjust the knob left and right ever so slightly until you are in tune with that frequency.
The ways that we tune ourselves to the frequency are through our Orisa songs and drumming, because the wavelength of the song is going to match the wavelength of the Orisa.