Wave to MID syncro problem

Hey!
Have anyone of you tried to add wave (or mp3) to MID, in syncro...like a guitar solo or vocal backs.
I've been trying every trick and spend days days but still not working in timming.It's always a delay or earlier than right time.
Any ideas?
Thanks...
Vio

For years (15+) I have prerecorded live hqarmonies and simple backing rhythm arrangements to sing and play with. I never saw the need to sync, because they are real audio files playing through the PA as if they were additional band mates.
I used to use MiniDisks, then MP3 players, laptops, and now...my Korg PA800 does it for me internally !
I have the "Dave Boyd Five" with me at all times!

Well...you're right..I can record everything in Audio, with my M-audio card, live guitars and blues harps,then import it like Mp3 in Midjay and here we are...
I used to put backup vocals or guitars in the sampler of SD1 I had till last summer.I could control volumes and efects for the "audio" part, a kind of balance between waves and mids.
Thanks
Vio

Vio, with BIAB you can do that plus much more.
http://www.pgmusic.com/