How to generate two voltage waveform with different frequecy

Hi  I'm using NI-6361 to generate two voltage waveform with different frequecy and different  amplitude.I have used DAQmxCreateAOVoltageChan(.."Dev1/a0:1"....)fuction  and DAQmxWriteAnalogF64()fuction,the program can generate two voltage waveform  with different  amplitude,but the same frequecy. seek help.Looking forword to  your letters. thank you