The Highland Reeds Drone Harmonic and Moisture Control System (MCS4) is a lightweight, versatile solution designed to keep your drone reeds drier, helping your pipes stay in tune longer and maintaining consistent air pressure. Positioned at the top of the bag, it’s easy to install, adjust, and maintain, without adding bulk or altering tonal quality.
 
Equipped with removable, screw-adjustable drone valves, the system regulates airflow for a steadier drone sound. These valves can be removed if not required, making the MCS4 adaptable to your playing style while delivering reliable moisture control and improved performance.