QUOTE(JBravo @ Nov 13 2006, 20:53)

I'm starting to record my own music, at least I'm new to trying to get a decent mix and bein able to export this or to give this to people, but I've never understand the position instruments and voices should take in the mix, I mean how far should I pan the voice and the guitar so they won't overlap, if you have tested any models or if there's some kind of guide to follow I would appreciate if you would share it with me
Thanks

--JB
There are people on HA far better qualified than me to comment, but it's conventional to place the lead vocal dead-centre. To make the recording mono-compatible, you should also avoid anything weird like inversion of the left versus right signal for the vocal. Inversions in the reverberation (delayed ambient room reflections that you can simulate in many audio editors).
Also avoid extreme panning (e.g. placing objects solely in the left speaker or right speaker) as this creates an "inside-the-head" feeling when listening on headphones.
I have heard a few effective tips for adjusting the perceived height of the sound-image. A good one is to use EQ to provide a minor boost or cut (1-2 dB is probably all) in the 7-8 kHz region (from my memory) to raise (boost) or lower (cut) the perceived height of the sound (especially when listening with headphones). This is apparently related to effect of the ear's pinnae in differentially filtering sound from below or above the head.
I remember reading an old post on HA in about 2001 or 2002 that explained this, and I tried it with fb2k's Equalizer.
I'd suggest that you listen carefully to a selection of pre-recorded music that sounds good to you, which you wish to emulate, and try to sketch out the perceived sound stage. You can experiment and compare again.