One approach is to write into the waveform used by the CloudBank behind its back. In this example, the waveform is named 'wave' and I scheduled a MemoryWriter in parallel that writes into some memory called 'wave'. The MemoryWriter Capture and the Reset of the LFO (multiwave) are both controlled by the button called !Trigger. Select a ModShape from the list of wave shapes. Then press Trigger to write into the wavetable and change the waveform used by the CloudBank.