Good post Bill. Interesting experiment with backcheck. With an action model, you can clearly show that the backcheck functions during drum repetition. Keep adjusting the backcheck (in small increments) to check the hammer higher Keep adjusting the backcheck (in small increments) to check the hammer higher, playing the model after each adjustment. With someone doing the drum rep- etition and someone placing a rule where the hammer seems to "stop" during the repeti
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