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[Feature Request] Implement frame blending option #239

@PuzzoMolto

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@PuzzoMolto

Hello! Sonic Advance had some effects that took advantage of the image retention/ghosting of the GBA's screen, including faux transparency on the shield. Could a frame blending option be implemented in this project? My only reference for this is the Retrotink 4K, which has a toggle-able "LCD Blending" setting. Here's an example of this effect in Sonic Advance specifically: https://x.com/mrmoroplays/status/1781368988737380850

At the cost of a small bit of motion clarity, I think some players would appreciate an experience that more closely mimics how the game looked on a proper GBA console. Totally understand if this is out of scope for this project, though.

PS: I apologize if this isn't the proper place to drop this FR, I'm quite new to Github and am not 100% on etiquette yet.

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