How do I turn MIDI into audio samples?

Hi there

I produce my music on cubase 5 and want to create a sample of my VST synth sounds to give to the keyboardist in my band so he can play the exact sounds used on the original recordings in a live setting. His keyboard runs through a laptop and is set up to do this, he says he has the ESX24 or something. I just have to sample my MIDI. I don’t know. It’s all really confusing and scary for me.

I’ve been looking for guidance online but I’m really struggling, which is why I’m here.

Hope someone can help.

Many thanks