Request for Adding a Mute Sound Combo (like Hori Controller)

[FokinoPelvis]

I would like to propose a feature enhancement for the Super Game Boy Plus system, specifically related to sound control. Currently, the Hori Controller includes a convenient "Mute" button that allows users to turn off the audio with a single press. However, for those without access to this specialized controller, there’s no easy way to mute the sound directly on the Super Game Boy.

To address this, I am suggesting the addition of a combo input — such as holding down Select + R for 2 seconds — that could serve as an alternative way to mute/unmute the audio. This option would provide all users with a simple, accessible method to toggle sound on and off without requiring the Hori Controller.

Thank you very much for considering this feature request, and I appreciate your time and dedication to enhancing the Super Game Boy experience.