@deanmacgregor: I've had a look into this and I can't find a way to disable the tone that plays when you increase/decrease the Ringtone Volume using the Volume buttons on the side of the phone. As a workaround, and I appreciate it's not ideal, please tap the Volume Up/Down button > Swipe down on the volume slider to show your Volume menu > Select 'Use Volume Keys for Media'. Now, if you want to increase/decrease your Ringtone Volume you will need to tap the Volume Up/Down button > Swipe Down on the slider and user the Ringtone slider manually. Note: If you do this via Settings > Sounds and Vibration > Volume, then it will play your ringtone, so best avoid that method. Apologies for any inconvenience this may cause.