Soprano/ Alto Diatonic Adapter for Sonor Universal Orff Instrument Stand The Sonor AD 1 Soprano / Alto Diatonic BT Universal Stand Adapter is a required part for Sonor Orff Instruments with 3 leg brackets The AD1 Adapter is used with Soprano, Alto and Bass Orff Instruments with a 3 leg bracket design to use with the Sonor BT Universal Instrument Stand The Sonor AD 1 Soprano / Alto Diatonic BT Universal Stand Adapter is a required part for Sonor Orff Instruments with 3 leg brackets The AD1 Adapter is used with Soprano, Alto and Bass Orff Instruments with a 3-leg bracket design to use with the Sonor BT Universal Instrument Stand The Sonor AD 1 Soprano / Alto Diatonic BT Universal Stand Adapter is a required part for Sonor Orff Instruments with 3 leg brackets