I want students to hear BOTH or EITHER of my tracks to sing along to..how?

[Amy Clark]

Hi there, I posted two parts of a song, and want my students to be able to choose a track to sing along to, or hear both to sing along to for color, is that possible? there are  to parts to the song. thanks!

[Dake Zheng]

After clicking "Add a Track",   you can "Choose tracks to Sing with",  default selection is track 1,  one can select additional tracks using the down arrow. I believe you can select up to 6 tracks to sing with.