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Originally Posted by Geoff Rymer /img/forum/go_quote.gif
Huh? Playback should always be at the same speed, no matter what the method of achieving this (multispeed+buffers or just singlespeed), or am I missing something?
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Right.
Zaireeka is a 4-disc album by The Flaming Lips wherein all 4 discs are designed to be played simultaneously on different players. It's like... psychotic quadraphonics, or something, only doubled, cos each CD player is obv. in two channels. Octphonics?
Anyway, there is a lengthy blurb in the sleeve by Wayne Coyne which explains how they discovered, while putting it together, that all CD players, even if they are the same make and model, will play at slightly different and differing speeds, meaning that each player will lag and catch up and take the lead at different times. This is down to two (million) things, namely that CD players are mechanical devices and therefore subject to constantly variable factors such as friction, heat, etcetera, as they phsyically spin the disc, and also they rely on software to read the disc and tranform the data to sound, and the electronics are also subject to variations in efficiency due to heat, dust, etcetera. No two playings of Zaireeka are the same, even if you use the same players, for this reason.
If you're starting two copies of Kid A 17 seconds after each other and they are syncing 'amazingly', this is serendipity and psychoacoustics in action. Someone says they sync; you want them to sync; you listen for instances of syncing and therefore find them. Same principal as being afraid of spiders; looking for them subconsciously; spotting more of them than a non arachnophobe who doens't think of them at all. If you will it, it will come. Basic tenet of existential self-realisation. Coincidence is generally subconscious opportunity-manufacturing.
Also, given the nature of music, pretty much any two CDs started any increment of seconds after each other will produce moments of 'magical' syncing - overlaid, intersecting rythmns are called grooves, and overlaid melodies are called harmonies (or dissonances!) (or something...). That's just how music works, that's why singing songs in-the-round works or a DJ mixing two tracks together works. Anyone who's ever edited video footage to music will know that you can drop a track over pretty much any visual activity and find magical moments that sync. It's not magic - it's science! Which makes it better than magic, cos anybody can do it.