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Rover 5 - 4 Channel Motor Controller: PWM Frequency

I just got hold of OddBot's Rover 5 platform and the 4-Channel Motor Controller.  I'm still fairly new to all this and I'm not sure what PWM frequency to use for the controller.  The datasheet that I have doesn't specify so I'd appreciate any advice you can give me.

Many thanks.

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Thanks OddBot.

I wanted to be sure that I wouldn't damage the controller.

The frequency doesn't matter too much although lower frequencies usually provide better torque. High frequencies increase the inductive impedance of the motor and reduce current.

The 4-channel motor controller should be good with frequencies up to 24KHz.