Volume control +/- will not work if your headphone/speaker does not support AVRCP profile. If your headphone/speaker support AVRCP profile but the volume control +/- on Audikast Plus still not work, it may caused by the CSR chipset incompatibility, you will need to upgrade the Audikast Plus as following.
InstallBlueSuite_2_6_9_1584.exe
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