I think vimeo was being slow to make them available then - works now.
You know that a bare stepper not connected to a load is the most resonant confuguration and thus usually will have strong mid-band resonance issues. Whereas any mechanical system with damping (belt-drive, rubber-coupling) will be less prone to resonance. Microstepping reduces resonance by reducing the step transient size.
Resonance is not strongly affected by supply voltage, that affects the available torque at speed and top speed mainly.