Send a clock signal to the TEMPO input and gate signal to the RUN/STOP input of the mother32.

To clarify it:

RUN/STOP
When a +5V signal is applied to this input, the sequencer will play from its current pattern location for the duration that the voltage is applied. When a 0V signal is applied to this input, the sequencer will stop at its current pattern location. The sequencer responds to the last action of either the RUN/STOP button or this input.

NOTE:
An external clock signal applied here will advance the steps of the pattern in the same way repeatedly pressing the RUN/STOP button does, but the internal clock is NOT synchronized.

Conclusion:

Sending a clock signal to RUN/STOP cannot be used as sync. clock. You need the tempo input for this.

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