A new and distinct cultivar of grapevine which is characterized by producing a large, bright purple to dark purple-skinned, seedless grape, is described. Each unit provides an incremental transition delay interval DELTA t. During operation of an associated iontophoresis device, the sacrificial material will be sequentially consumed; the first upper layer will be fully consumed followed by the linking conductive base material of the exposed linking area of the base layer which severs the base layer thereby breaking circuit continuity disabling activity in the device. From such information, a transfer function characterizing the sound producing system is generated.