I've been wondering this for a long time since I record. When recording a guitar riff I always adjut the volume to the maximum without it hitting the clipping level (just below the clipping line). So if I put a little bit more volume it would clip. If I play the same exact riff again with the same volume and mix it, it will obviously clip because it's like your doubling the volume. Am I right on that? But if I record another different guitar riff (like rhyme guitar) and I adjust it to the maximum volume without it hitting the clipping level than mix it with the first guitar riff it won't clip. Am I right on that? You can play two same riffs with each one as max volume as possible without it hitting the clipping level and mix them together, but being sure they are different instruments (like keyboard, and guitar) and it won't clip. Not only instruments but vocals as well. If vocals are the same notes as a guitar riff and you mix them together with each one as much volume as you can get without it clipping they won't clip. Am I right on that as well.

That's is what I'm thinking and that's what I've always been doing. I've always adjusted the maximum volume for each guitar part I record and mix them together but being sure every guitar riff I record aren't the same thing (like lead and rhyme or 2 or more guitar parts playing harmonies). So in conclusion you can mix as many instruments parts as you want but being sure they play different parts or are different instruments (like violen and guitar, or guitar and keyboard). So you can mix a 100 guitar parts together and they won't clip if they all play different parts?

If you use a compressor while your mixing (a software one obviously, most likely theres one built in to the program you're using), then it'll stop the clipping completely, so you'll be able to play the same stuff without getting nasty boosting where the tracks 'merge'

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Yea thanks for the advice but I wasn't asking about that. Yea I connect my guitar to a compressor pedal and it sounds pretty good. But when I'm recording with my recorder I always adjust the volume level meter to the maximum amount just below the clip line. I do that with all the guitar parts I record. Than I mix them together without lowering any volume of each guitar part. As you think of it logically when I put them together the volume is suppose to go twice as much far beyond the clip line. It doesn't actually, the volume meter stays the same. That is what I am pondering. For example this recording I did, didn't seem to clip to me and there are two guitars. 1 lead and 1 rhyme and each one is adjusted to the max volume I can get it without it hitting the clipping meter. Than I simply mix pasted them together including the vocals. http://songs.hijazi.us/DuskyForest.mp3

I think I know what you are getting at, but since English is not my native language I'm not completely sure what "clip" means, maybe if you told me...?
Anyway, twas' a pretty good piece.

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you need to compress your recording, not just your guitar.
when i record with my little dinky audacity recording i record both tracks at the same volume and sometimes they clip (just a wee bit), i compressthe recording after its all done, all the gutiar tracks. i usually eq it too.

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I found the solution. In my recorder I have 12 tracks. Each guitar riff or instrument part I record is on 2 (or 1) tracks. What I use to do before is; after recording on all the tracks I use to simply just mix paste them all together.
Here is the solution if you want to be sure your song doesn't clip. I use bounce record. Basically bounce record is recording all the tracks into two tracks and at the same time while recording adjust the master volume (affects the volume for all the tracks) and the volume meter for each tracks. Adjust the levels so they won't reach the clip level. Use the level meter to adjust single tracks and the master volume for all the tracks. And when you’re done you get all those tracks into two tracks without any clipping. So simple. The song I put up in the top post was recorded in my old way by recording and just mix pasting them without bounce recording. It didn’t clip that much because there was only two instruments. Lead and Rhyme guitar. If there was more than it would of clipped if I didn’t use bounce recording.