Hi Rikki, as far as music is concerned it is just relaxation as a self taught hobby, the Technics and non-Technics related consultancy work was offered as a result of writing on forums, I have many other interests.
Top end keyboards store their samples in Rom of around 64-96MB nowadays, the 7k with all soundcards has 128MB for instance. This digital data is compressed with proprietary algorithms so the wave equivalent is several times greater than this.
As computers get faster it becomes possible to store the samples on hard drive and retrieve them fast enough to play live with full polyphony. But these software synthesis programs can have a sample library of 20GigaBytes or much more, huge amounts of data just for orchestral strings for example. Not only that but the resolution can be many orders of magnitude greater than the existing quality (32 bit 96kHz samples rather than 16 bit 48kHz) so that when mixed down to cd the low level losses are negligible.
On a keyboard you can pan left/right and give a pretend depth effect with reverb. With software samplers you can mix in dolby 5.1 surround sound. At some stage the hardware keyboard as we know it will be redundant, since so many nuances of acoustic instrument playing can each be separately sampled and mapped by pressure and other controllers to the keyboard at a resolution that is breathtaking.
As excellent as our instruments are at a huge range of popular music, you cannot sit down and multitrack the slow movement of Dvorak's New World symphony and get a sound that anywhere near approaches a recording of von Karajan conducting the Berlin Philharmonic. But one day soon you might start being able to get much closer...