cmato'a lujvo

t1 is a tone low in pitch/frequency from source t3.

Cf. cmalu, tonga, smaji, lauble. See also ganto'a.

In notes:

ganto'a
x1 is a note low in frequency/pitch produced by x2
lauble
r1=c1 sounds quiet/weak at observation point c2 by standard c3=t3.