My Roland EA7, I record direct into the keyboard...usually sample C3, C4, C5 and C6, I save the samples and open multi sample, edit mode...placing the four samples in their proper range...save the Multi sample , and make a user tone from the sample..
That sounds so easy... except all great tones on the yamaha are multi layered samples... if yoi want true expressiveness in your tones it will require a few more samples...
If you want to do this make sure to use a midi file, that plays the Yamaha tones at exactly the right velocity.. (to find out at which vellocity which sound samples are played use the YEM editor of your Yamaha to find out)
True..... most keyboard sounds are 2 or 3 velocity layered samples.... still not complicated, but time consuming..
No one will receive the level of sampling done in the recording studios of major manufacturers..
Consumer sampling is to capture the essence of the sound you want.
The hard thing when sampling is edditing the loop of each sample...
You need to eddit the loop otherwise your sample sizes become way to long. Which makes sampling a timeconsuming (but fun) thing to do..
Personally i am a big believer that you can get better and easier results from edditing your sound. Then from sampling your owns, sampling is a real art only mastered by a very few... in general thats the people making money from this..
In general when i want a sound, i search for something thats close to it (not that hard most of the time with over 1000 sounds in the database.. and then edit it to my liking.. most of the time, i get there trough the major 8 setting of each sound on the pa4x. ADSR! filter and LFO settings.. and otherwise there is a huge depth beneath that..