What do you mean by "control multiple channels"? If you want to set multiple voltages at once, you can use write_dac multiple times and then one load. Something like this should work in that case:
self.zotino0.write_dac(1, 1*V)
delay(100*us)
self.zotino0.write_dac(3, 0.5*V)
delay(100*us)
self.zotino0.write_dac(10, 2*V)
delay(100*us)
self.zotino0.load()
