Controlling Cross delay BPM

I want to use just one deck for skratching with Cross, and I want to use the delay, how can I set the BPM for the FX? The beat is not playing through Cross, but I would like the FX to work with a constant BPM, right now it depends on the BPM Cross calculates from the movement of the records, which needless to say is completely random... and useless for my purposes.
Can this be done? I have to play on TV early in the morning so I would be veeery thankful for a quick response
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Can this be done? I have to play on TV early in the morning so I would be veeery thankful for a quick response
