Okay, let me explain this one.
The main melody has two modes: Deep (deeper sounding) and Shallow (lighter sounding), and the 'heart monitor' sounds have four modes: Low Beep (sounds more like a time bomb countdown) A and B, and High Beep (the 'heart monitor') A and B. The A and B parts are different melodies (Low Beep A and High Beep A are the same melody for example).
So, I don't know which of these sounds better together, so 2 main beats times 4 'beeps' equals eight reps of different combinations (Both Deep and Shallow experience High and Low Beep part A and B, basically).
The song from beginning to end:
Deep Low Beep = DLB
Deep High Beep = DHB
Shallow Low Beep = SLB
Shallow High Beep = SHB
Part A = a
Part B = b
DLBa, DLBb, SLBa, SLBb, DHBa, DHBb, SHBa, and SHBb.
My favorite part is Deep High Beep B.