sentences:  However, as can be seen from the dates, Cowan's device (and others) pre-dated not only Keltronics, but most other devices.Other interesting developments included the Ross Technologies Programmable Electronic Bagpipes, which, though looking similar to the Bazpipe, was capable of playing in different keys in order to accompany different instruments.Their second generation model, could not only emulate the Scottish bagpipe and play harmonies, but could emulate other instruments as well.