Okay guys, thank you so much for your answer. With some tryouts and some bad moments I finally found out how to do this so here we go. in my case I am using Sonar 8 and Fl studio 10 and vista 32. I started out by created a new blank project in sonar. then I started by adding 3 buses, one Master, one FX Send and one bus that I named Drum bus. Since I`m gonna use Fl only with my drums I named the bus after that. Okay.. Now, start by adding a new VSTplugin and select Fl studio vsti. A box will pop up, make sure you select "simple instrumental track" and hit ok button. a new track and the Fl box will pop up. but if you see, you have no record button at all on this track but that`s ok. now, add a new audio track under the fl track. and now we have a record button :) This is what we are gonna do. Fl instrumental track : Select Fl studio sterio on input, and drum bus on output. The audio track : Set your soundcard sterio on input and drum bus on output. The drum bus: Set output to master. You don`t need this but I like to have the the finally adjustment on all tracks in the end. maybe I wanna do some effect adjustment on the drum track but in that case I wanna do it on the track itself. But the main effects on the drum track I will do in Fl studio. When you are happy with your drums, you just armed the record options on the track and hit record, fl will start to play the track and sonar will record it. you are done. You can also finish the track in Fl studio and export the track as a wave and just slide into the empty track in sonar but I don`t wanna do that, I want to control the Fl from the sonar. Thank you again guy`s for reply to me :)