Newbie: I need more cool sounds, 128 patches aint cutting it, can only use 128 patches from synth..... Options

[ash]

imac 500 Blue CD-RW, 256mb, Cubase, OMS, Technics Workstation WSA-1, Roland UM-1, Behringer MX1602a

First problem: I can only use 128 patches from my Technics Workstation synth, and it's got a lot, lot more than that; clearly this is very limiting on my creative output.
Secondly when I attempt to customise a sound: for example the B3 sound needs a soft attack and more decay, could also use a tad of phase-shift; whatever I do to the least of the instruments gets done to all of them; it applies the changes to the Synth SYSTEM output. Again, quite annoying. Neither of these problems occur when I sequence directly on the keyboard (seperate from Cubse) using it's GUI: I can tweak the sounds, add more layers to a sound, tweak those layers, adjust modelling, resonators - it's awesome.
last problem is that i want to create and edit sounds and then use them for recording; don't care whether they're audio files or whatever. On Cakewalk on PC I used to talk into the mic, sample it (as per setting alert sounds in MacOS) and then play the sound all up and down the keyboard, apply fx to it and record a song. Is this possible with Cubase?
One other thing, is the only way to burn a CD to wire the audio out from the mixer to the audio in on the mac.....cos that's pretty dodgy in my case.....it's gonna end up sounding like my old fostex 4 Track from the 80's.
So to wrap up: I want to make any sound I want, do it without buying more stuff, and use lots of these original sounds to create really cool music. Piano and drums is ok, but as Curtis said; 'Let's move on up!'

Cheers,

Ash