The Silent Brass --------------------------------------- The Silent Brass Personal Studio ST9 Personal Studio ST5 PM1 for Tuba PM2 for Euphonium PM3 for French Horn PM5 for Trombone/Bass Trombone PM6 for Flugelhorn/Alto Trombone PM7 for Trumpet/Cornet PM9 for Piccolo Trumpet The newly improved ST9 Personal Studio is has been reduced to a size and weight approximately 1/4th that of the previous model. It is a tiny amplifier, small enough to fit into a shirt pocket, which offers a choice of “clean” or echo enhanced sound. It lets you hear your own playing at the volume you are accustomed to, to prevent any over-blowing. An Aux In is a direct line-in for playing along with CDs or other recordings. The ST9 Personal Studio may also be purchased separately for players who already own a Pickup Mute. Personal Studio ST9 Power Supply 6F22/6LR61 9-Volt battery (Operation with Manganese batteries last about 12 hours.) Dimensions (W x D x H) 75 x 70 x 25 mm (2-15/16"h x 2-3/4"h x 1"h) Weight 65g (2.3oz) without batteries