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Direct Volume Control -- need implementation details for building ROM


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I represent an Audio Effects solution provider company, and we are currently working with several handset manufacturers, and are trying to resolve a problem supporting Poweramp.

We are working with Ice Cream Sandwich 4.0.3 developing a ROM for a next gen handset.

Currently we are integrating some AudioEffect into the system, which are applied to the global output mix. When Direct Volume Control is enabled, our effect is not applied, but if I disable Direct Volume Control, then the effect is applied.

I would like to know as much as possible about how Direct Volume Control is implemented, so that we can operate correctly with Poweramp (handset manufacturer's requirement!). Please PM me or reply to this thread, and we can arrange any legal matters such as Non Disclosure Agreement.

Thank you in advance!

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