When I load Addictive drums or EZ drummer + several vsts - starts cutting the tone

When I load Addictive drums or EZ drummer + several vsts - starts cutting the tone, 
 
I use 1 track for drums 
1 track for guitars on which i use ts808 vst then le 456 engl emulator then poulin lecab 2 add  4 different guitar impulses one eq and reverb and its okay but if i duplicate the track all hell breaks loose .
 
Intel Core 2 Duo P8400 (2.26GHz) 6 gb ram ddr 3 win 7 asio drivers for lexicon lambda external audiointerface.
Intel graphics card HD 8500 or 8700 not sure any advise ?
 
As you know for recording metal i need at least 6 tracks 4 guitars 1 bass 1 drums and 2 vocals .. this is the minimum. If it goes so bad on 3 tracks what do we make of 6 ... please advice me what to do ... im thinking of chaging the pc, but this one must be covering the requirements however this looks simillar to when u wanna play a game that minimum requirements are those and u have them but lets say the game for instance is real time strategy and there is a big battle the videocard and pc are not handling it too good ... does the same principle applies here ? or does it have to do something with my audio drivers

It sounds like you're taxing your CPU. Are your meters high when this happens? Is there any difference if you increase the buffer size/latency?.

Extreme low latency settings will always tax your system more. It really sounds simply as if you're running into the limits of your computer/CPU. The combination of things you're doing (expecting super low latency, using lots of VST FX per track) is designed to make it difficult for your CPU.

I would suggest, if it's possibly for you, to increase the buffer size/latency and see if that helps. You may have to use some form of direct monitoring to hear yourself during recording though, because playing with a lot of latency isn't very nice.

OR i could use another more stable daw - for instance reaper but ... i already have sonar x 3 producer and i dont want to change it for something else ... 

So in other words i need to boost my CPU speed somehow or get a new machine ... because disabling and enabling tracks ill loose where I'm at or what am I singing/playing nd stuff

VuL4o
So in other words i need to boost my CPU speed somehow or get a new machine ... because disabling and enabling tracks ill loose where I'm at or what am I singing/playing nd stuff

You don't lose anything. Read the manual about freezing/bouncing etc. Your machine can run loads of audio tracks, it's some of the VSTs that are the problem. Then, when you get in the mixing stage, you can raise the buffers and use heavier VSTs when latency is no longer an issue.
Also, you can for example disable EQs and reverbs of recorded tracks, or use lighter versions etc. 
 
I have a weaker PC than yours, and I can build 40 track projects (50/50 audio and MIDI) without problems.

Well how am i soposed to play what i want to play if i dont use the effects at real time i cant really understand what will be at the end ( that is for bypass vst ) as for latency and buffering i cannot afford to have latency because some of the stuff cannot be played at that kind of latency for instance at 180 tempo when u play alternate picking from 6 tones ull get 3 or 4 max with latency , but i have another thing in mind ... i am having an valve amp build for me and have a friend that hase the same thing and the only thing he does ( he has all his effects from the outside ) he imputs and records the signal ... so no vsts no **** ... so i Think that if i do that everything should be fine right ? But the thing is the way im working i will travel and i need a laptop that will do this for me ... or at least a pc ... can you please advise fome kind of machine that will do the work for 10 12 tracks no more than that 

Okey soo i did Ive log on to reaper ive put 1 channel ez drummer 2 channel guitar  vst ts 808+le 465 (fireball simulator) + le cab 2 on which i add 4 different sounds + reverb + eq  for now seems then i duplicate this track .. when i play them at the same real time bugging its ass off , turn of one record the other and play a solo on it its ok ... then i put a 3rd track again all hell breaks loose i remove couple of the features on the 3rd track and leave it just on ts808 vst ,,, barely standing with 80 % dropout on sonar it would have been on the second track ... sooo what now to play with the latency buffering fast /safe ? 

Okey im already thinking of buying new pc not laptop could you tell me what type of parameters do i need to work good towards great not just to start up the program

VuL4o
Well how am i soposed to play what i want to play if i dont use the effects at real time i cant really understand what will be at the end ( that is for bypass vst ) as for latency and buffering i cannot afford to have latency because some of the stuff cannot be played ....... 

Don't get stuck in the bypassing, freezing and bouncing are much more relevant, and they're mentioned in several posts already.
And you don't need to bypass, say, the amp sim you're recording, but some other FX on the other tracks. You don't need a convolution reverb or a linear phase EQ on a monitored accompanying track.
 
Whatever system you build for yourself, you can crash it with overload if you don't learn the basics of how to use them.

That's very true for track freezes, but freezing the synth removes the synth from RAM and prevents all CPU calls to it. Could be important for heavy duty synths - Kontakt, BFD, Omnisphere etc

Guys like i said i have already tried bypaasing the effects on the second track on first track im playing guitar plus 1 pedal vst 1 vst amp 1 vst cabinet with 4 impulses and 1 reverb and eq when i build the second track 1 VST IS AS FAR as i go witbout lagg ... i want to record myself for now ... after time when i have the money to build a studio it will be different thing my price top is 450 Us but im in Bulgaria prices are different here however i am orientated in bying a pc not laptop couse its always better alreasy have a 40 monitor as foe using mike i can do that but my amp is not ready yet ... Just give me if possible please pc parameters for good to great performance that will be great for now and i will keep trying bypass

VuL4o
Guys like i said i have already tried bypaasing the effects on the second track on first track im playing guitar plus 1 pedal vst 1 vst amp 1 vst cabinet with 4 impulses and 1 reverb and eq when i build the second track 1 VST IS AS FAR as i go witbout lagg ... i want to record myself for now ...

 
 Did you try freezing or bouncing? You've only mentioned trying bypassing. OTOH, if you have only two tracks, first with FX disabled, your PC should be able to handle it.
 
Also there are VSTs that can be very problematic on some systems. My system, for example, can't tolerate Melda Harmonizer at all. Are you perhaps using Perfect Space as the reverb? That alone could be the problem. You shouldn't use it when tracking, if you're short of horse power. Also, I don't know if it's "normal" to use 4 cabinet impulses at the same time (I did not know it's possible).
 
Then again, do you bypass clicking the bypass button in the VST? AFAIK that doesn't free any RAM, you need to bypass the FX bin (I'm not 100% sure I remember this correctly).

I said this before, but why can't you use a simpler setup during tracking, e.g. a simple Guitar Rig or TH2 preset that sounds somewhat close to what you need, then switch to the big chain and click freeze.

VuL4o
not sure if i know about freeze is there an article about freezing and if i push freeze what happens to the frezed channel is it muted

No need for special articles, just study the manual and tutorials.