How to make that heavy screech sound?

Start with Osc2 alone, detune=0. Increase FM amount and set FM source to noise. The "whaoh" character can be done with the filters in either serial hipass and lopass or parallel bandpasses. In any case use a fair amount of resonance, and modulate the cutoff using the filter envelope (another possible source is an LFO in env mode, especially LFO2 which has the filters pre-routed). Final step is distortion. Mono+portamento could be helpful when playing such a sound. You can also polish it up with some effects.
Hope this helps.

You are on the right track, you just need to filter out some of the low frequencies. See if you can add highpass to the current configuration of your main filters. Also try the various filters available from the filterbank effect as highpass, as well as reducing the low EQ - those should do the work even if you can't change your current main filter configuration.
Hope this helps.

play with portamento and fx: curry overdrive + vowel filter + EQ

i actually was able to programm a very similiar screech on my ti2

did you get the result you want?

you are almost there, bring up more high freq, and play on higher notes

here's the one i made, is this what you are looking for?

http://www26.zippyshare.com/v/89160920/file.html

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Mindnezz - you are close, It's just that the sound is too "centered". You can smear it around using various FX such as choruses that have a X-over knob, which you can use to affect only the high frequencies. You can also use twin unison with maximum pan spread, but this will double the resources of the patch.

I used chorus in this patch:
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Hope this helps.

whad kind of ditortion do you use ?

Did you manage to recreate it?