Why not use the pitch bend control? Opening the Celtic Whistle sampler reveals there are four groups of eighteen samples each, programmed to respond to continuous controller 1 midi data: - vibrato, from 0 to 9 - vibrato + slur, from 10 to 63 - no vibrato, no slur, from 64 to 117 - no vibrato but slur, from 118 to 127 So what else do you expect?