Light ethereal play- Liszt

[artist]

I'm learning Liszt's first Mephisto Waltz and am having some difficulty getting the long run on the third to the last page to sound light and weightless as it should sound and as it does sound on professional recordings. It's the run that starts low  on the keyboard on A and runs the entire length of the keyboard to a repeating sequence topped off by high g and then descends again to a trill.  As light as I try to get it, it still sounds too heavy in spots.

Have any of you performed this Liszt piece and if so, how do you get that very light and ethereal touch and sound?

Thnx

[xenia]

WITH VERY ACTIV FINGERS AND SHALLOW TOUCH !
 
 

[tosca1]

Paradoxically, light ethereal playing and the production of  that ravishing "liquid" sound is best achieved by heavy, relaxed forearms and complete freedom in the wrists.
The passage will never sound right unless it feels almost effortless to play.  
It is the speed of the key depression that will determine the volume.
I am not familiar with the run in question, but it will obviously require dedicated, slow practice and an effective fingering.