Our recording room has two straight walls and one curved wall joining the other two. One of the straight walls and the curved wall is of rock, while the other straight wall is mainly glass doors and windows. We put foam mattress against the glass wall, mainly to stop bird and wind noise coming in (we have bush [forrest] surrounding our home). The room is not too lively and not dead; kind of ideal really. I am unable to afford acoustic treatment at the moment, but am able to hang blankets, doonas and mattreses if needed. My question it this. Which wall should we face to get the least amound of reflection; should it be the curved wall or one of the straight ones, or even the vertex. :?