A Glenn an Looy ABC replaces your 4th Valve Bottom Cap and you can adjust the weight to gain optimum “Note Centring and Securing” for your Euphonium.
It’s the same diameter and thread as your Instrument and helps greatly in terms of Note Centring and Sound Projection, with the Science being “That adding (the full spectrum of sound colour within each semi-tone)”.
The most common comment from players is . . .The evidence is yes, but just to make sure, you can try one for a month and try – anywhere in the world!! With our unique world-beating offer you’ve got nothing to lose!