[Arnold Krille <arnold(a)arnoldarts.de> wrote: ... The alternative to having multiple virtual speakers fed with the same signal is to spread a single channel out. You split the channel into a range of frequencies, and then place each frequency at a different position. This was a technique used on the old analogue Ambisonics studio kit. The same idea is used in the PS22 Stereo Maker plug-in from Waves Audio although, in this case, it is being used to spread a single channel into stereo. The screenshot on Page 21 of their manual should give you the idea, visit: http://www.waves.com/Manuals/Plugins/PS22.pdf It should also be straightforward to extend the technique to 3-D using an elliptical spiral. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/