Stddeviation/BBand on volume

Hi

I have created BBands on volume panel If volume bar closed above bband top then it is buy scan but i'm not getting proper results. Can anybody pl. help on this afl.

Buy = Volume > BBandTop(20,2);

Sell = Volume < BBandBot(20,2);

Filter = Buy or sell;

Buy = ExRem(Buy, Sell);
Sell = ExRem(Sell, Buy);

Where I'm going wrong. and also how to plot std. dev. bands on volume.

Thanks for correcting this one.

Use BBandTop(V, 20, 2) and BBandBot(V, 20, 2)

thanks, solved.