Try this. It works in a different application for me but in changing the numbers I might have messed it up. I can't test with your exact code as I don't have the DLL. The principle is simple enough; one of the two signals only plots when the ValueWhen() function is triggered by a logical TRUE (on all bars). For the 1 and 2 options it plots N/A. The other output uses an If() function to shift between one plot and the other. The N/A result may make this inappropriate for what you're trying to do but if it's just a visual signal (or two) that you want then it should be fine. I'm sure there are other ways to do the same thing. This just happens to be the one method I have already found to work. I use it in my Portfolio Equity tool to plot an equity curve, the number of active trades, or both (see the December issue of MSTT). {User inputs} plot:=Input("1)Long, 2)Short, 3)Both",1,3,1); factor := Input("SafeZone Factor",0.0,20.0,2.0); lookback:=Input("LookBack Period",10,300,99); ls:=ExtFml("ElderDisk.SafeZoneLong",factor,lookback); ss:=ExtFml("ElderDisk.SafeZoneShort",factor,lookback) {Plot on price chart} ValueWhen(1,Plot=3,ls); If(Plot=1,ls,ss); Roy MetaStock Tips & Tools