Boss FV-30H/FV-30L Foot Volume ฟุตสวิทช์ วอลุ่มเท้า
FV-30H—A high-impedance pedal (with dedicated tuner output) that’s best for connecting directly to an electric guitar or bass.
FV-30L—A low-impedance pedal equipped with stereo input/output for stompboxes, keyboards, and other digital instruments.