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--- David Myers <dmgraph@earthlink.net> wrote: > Does anyone know of a way to expand stereo tracks > into surround without reworking them track by track Hmmm, that's a tough one. You could possibly extend a technique they used to use in the 60's and early 70's to stereo-ize a mono source (why is Jeff Beck's 'Guitar Shop' album playing in my head?) that entails running the signal through both sides of a stereo graphic EQ that has as many bands as possible. Alternating frequency bands are set on the two channels; for example, the left side might use the odd bands and the right side the even. The full audio spectrum would be expanded from one channel to two based on frequency content. (One thing about this technique that sounded sort of phony for regular pop music that might work rather well for ambient/electronic stuff is the fact that glissandi of certain narrower-band waveforms will pan around as they pass through the respective frequency bands!) For surround, possibly *two* such EQs could be used, so your two channels become four... I'm not sure what you'd do about the fifth channel. (Maybe some sort of phase cancellation trick like the one described in the liner notes of Eno's "On Land" <http://music.hyperreal.org/artists/brian_eno/onland-txt.html>; I've used this technique with multitrack bouncing (rather than with speakers as described) to enable certain sounds to 'sit' better in a mix, but have never tried both techniques together, so I don't know how it'd work. Of course, after splitting up the signal, you'd need to re-master, and this is a *four hour* piece, you say? Robert Rich ran into certain technical issues when he recorded 'Somnium' as a 7-hour audio DVD <http://www.robertrich.com/rrsomnium.html>; he may be able to provide some tips/advice... <http://www.robertrich.com/contact.html> -t- __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/