Hi
If you have a computer and a daw like Cubase, you obvously would have a few VST instruments.
Vst 's like Korg, Arturia Sampletank etc will open up a minefield of sounds to sample quickly and easy
At the moment you can only sample VST 2, and the Samplerobot makers say vst 3 will be possible on a later update.
Once you have a sample and converted to SF2 ,just tweak away in YEM until you have what you desire.
Read the manual and look at the video's and it will only take a couple of weeks to master it.
All the Best
John 
It is possible to sample VST3-like plugins in an improvised way.
I usually use this method even to clone VST2 plugins.
And this is very useful when you already have the preset ready or the template of a plugin configured inside your Daw.
Basically you use a driver that works like a virtual asio cable, like Sinchronous Audio Rowter where you create so-called "endpoints" or Voice Meeter that works like a virtual console.
In case you use the first one, in your DAW, send the master output to this virtual cable in addition to the audio interface.
In samplerobot just configure the Asio virtual cable as input device.
It also needs a virtual midi cable like loopmidi so that it can send the midi signal to the Daw and it can play with the plugin.
Regards,
Gabriel