Re: I can't make strat's sing!
OK.....there could be two different things going on here, and maybe an overlap of these things.
1) You say 'StratS'....plural.....do you mean that literally? Because if you actually mean perhaps just one that you own, maybe it has an inferior nut, bridge saddles or needs a better set-up.
2) I don't want to make any assumptions here about how you play guitar, and you may already know and do what i am about to mention. Playing Gibson style guitars can be a smooth and easier experience to start getting a good version of the sound you expect from those styles of guitars. But Fender-style instruments are a whole other thing.....played 'plainly', they sound plain, not characterisitc. There is an 'attitude' you have to take to the guitar to wrench out the classic Strat sounds....'digging in' with your pick attack, gripping hard with the fretting hand and really working those notes and chords. Strat playing is hard work generally, and the more work you do, the more of the classic Strat tones will emerge.....including things like quack, jangle, fatness and sustain. Strats tend not to simply 'give' you their sounds, rather they seem to challenge you to extract them. It is almost a lifetime's work, a never-ending thing.
You don't mention the exact guitar you have, whether it's stock or has modified hardware etc., what woods it has and what it's condition is, how you normally hear it (acoustically, through an amp, headphones, amp modeller etc.etc.....).....more information would probably help people here to understand whether your instrument is in need of attention, or, if it is the case that you have played a bunch of Strats and always have this problem, maybe others here can help with suggestions in how to 'attack' the issue, literally.
Give us a bit more info if you can, plenty of Strat players here who'll be able to offer you something......