The nerd quotient of Silent’s project is nearly off the charts.
The sound created by movement of the head, which is moved in steps with sufficient frequency. Interface description can be found, for example HERE. Simply activate the station by providing a low-to DRVSB0 or 1 (depending on whether we have the tape from the cross and to which the plug is connected to the station) and choose the direction of head movement (low \ high on DIR) and the trailing edge of the head movement will cause STEP one step. ATMega microcontroller controls the whole.
(Google translated from Polish) [Via Hacked Gadgets]