SOUND VOLTEX VOLTECON VIRGOO This is a Chinese-made controller. Buttons: DAO buttons Springs: 20g Uses an old PCB - The left blue knob has a poor response. - The back panel is missing screws. - No soundproofing has been done. * Felt sheets can be included if needed, but when combined with 20g springs, the button rebound will be weaker and not compatible, so you will need to prepare stronger springs. Please be aware. We recommend this for those with knowledge of parts replacement, etc.