[ZOA NOM]

I would describe the process as follows:

Setup: Heading down straight in 4th gear preparing to downshift

1. Simultaneously clutch in and slip gear knob out of 4th into neutral.

2. Simultaneously blip throttle and engage clutch quickly. (I imagine a button hovering above my clutch knee that is pressed when I "blip" my clutch knee up.)

3. Gear knob should almost "fall" into 3rd, and you are back on the throttle.

Engine sound should remain fairly constant, but punctuated with the quick blip in the middle, and rising as you accelerate once in gear.