I want to create a musical instrument that shows a led for each key. A bit like this, but not in a piano.
Click image for larger version. 

Name:	img-ce-gallery-kks-mk2_overview_visual-feedback_gallery-a-5db5b1d09cbc03d9a42608888d940be4-d.jpg 
Views:	39 
Size:	68.9 KB 
ID:	23130

I want to know if it is possible to control cheap led strips (very common on aliexpress... for example 5V strips having 3 pins WSxxxx ) from a Teensy board.
What I need is :
- Approx one meter led strip
- Need to address every led separately by code
- connect directly the pins from the led strip directly to the Teensy board, without any external component, boards...
- Leds should be powered from the Teensy USB.

How many LEDS can I power from USB? Is it possible to lower the power of each LED by code, to be able to light more LEDs?

Regards !