Raptus Regaliter

Recent bouts of naughtiness aside, I\'ve been working on finishing a pair of tracks for issuing as a free single around Xmas on the Sinistrals website.  Both are in final stages, requiring vocals and other finishing.  I\'ve been having trouble with one.  \"Panic Attack\" has a guide vocal and had a solo.  Trouble was, the solo sounded out of tune, so I scrapped it and put another one on yesterday.  Now I\'ve listened to it through a CD player, it still sounds out of tune.  I\'m beginning to think it\'s down to an EQ problem in the track - two sounds are too similar, and that is causing phase cancellation or phase doubling, leading to a very unpleasant effect.  I\'ve had this problem before, and that time it was due to the bass guitar interfering with the lead vocal.  The trick is to mute tracks until you find the one that is interfering with the other.  There is also a danger that my monitor speakers (a pair of JBL control 1s) are colouring the sound during the mixing.  This means that I\'m going to have to sit and twiddle with the mix and the EQ until I find out what is wrong.  

This may all be down to the guitars used in the track, as I used the (single coil DeArmond, hollow body)Harmony Meteor to lay down two tracks for the riff that is the main feature of the song, then the bass was added by Martin using my (single coil, hollow body) Viola bass (the one that makes him moist).  The lead was done on the (humbuckers, semi-acoustic) Epiphone Sheraton in both cases.  It might be that I need to do it on something more trebly like the Stratocaster.