je ne vois pas trop ou est l exemple dont vous parlez?
1.43 Added DualMotorShield example. Shows how to use AccelStepper to control 2 x 2 phase steppers using the Itead Studio Arduino Dual Stepper Motor Driver Shield model IM120417015.
1.44 examples/DualMotorShield/DualMotorShield.ino examples/DualMotorShield/DualMotorShield.pde was missing from the distribution.
c est tout ce que je vois
sinon tone() fonctionne