RC505 : how to turn off direct dry signal ?

[nanda]

Hi everyone, I use the Rc505 as my primary tool for all my composition duties with my guitar. its a great unit & all the looping is fantastic. sometimes, i also use the rc505 as an audio interface to record into my computer DAW (FL studio). I add some realtime fx in the DAW while recording into FL, such as an EQ or compressor.
when i am using the rc505 as an asio interface for recording audio into my computer, i face a problem where i hear both the direct monitor sound as well as the effected sound together. however much i tried, i could not find where i can turn off the direct monitor sound , to hear only the effected sound when recording. i tried the USB in & USB out volume settings of 0-200 also, no luck.
any suggestions? pls help.