Start with this circuit: Power + Micro Sequencer + Oscillator + Oscillator + Envelope + Speaker
Set your rhythm by adjusting knobs on the micro sequencer.
Turn the pitch of the first oscillator up (clockwise.)
Turn pitch of the second oscillator up until you reach a metallic sound - like a bell.
On your envelope, turn decay knob and attack nob down (counterclockwise) until you achieve a "pinging" sound.