Volume Control On My iLuv Earphones Does Not Amplify Sound

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I tried on my old Sony Ericsson's earphones and iLuv earphones and you know what? Sound is equal on both but only when volume control is set to max on iLuv earphones. I can only decrease volume with iLuv.

Don't know if this is the case with iLuv only... I want to get ZAGG's smartphones. Maybe their features will work with my Desire S.

Mh, good to know.
Could you tell me if volume control works with non-smartphone devices like mp3 players? Thanks

Even if it does not amplify sound, it could be an asset to me.
Otherwise I'm getting tired of looking for a in-ear with volume control.. it's impossible to find one without spending lots of money.