import bpy 

def all_speakers(scene: bpy.types.Scene) -> list[bpy.types.Object]:
    return [obj for obj in scene.objects if obj.type == 'SPEAKER']


def solo_speakers(scene: bpy.types.Scene, solo_group: list[bpy.types.Object]):
    """
    Mutes all Objects not in `solo_group` and ensures all objects in this group
    are not muted.
    """
    for speaker in all_speakers(scene):
        assert type(speaker.data) is bpy.types.Speaker
        if speaker in solo_group:
            speaker.data.muted = False
        else:
            speaker.data.muted = True

        speaker.data.update_tag()


def unmute_all_speakers(scene):
    """
    Unmutes all speakers.
    """
    for speaker in all_speakers(scene):
        assert type(speaker.data) is bpy.types.Speaker
        speaker.data.muted = False
        speaker.data.update_tag()