Here's some info on the "how" audya works ..
This is from the "solton club" ...
Initially one of the main problems using live audio was audio loops of different tempos if played together
fall out of sync
The solution was to use loop slicing. Loop slicing solves this problem allowing you to adjust the tempo and
length of a audio sample without changing the pitch or sonic character of the instrument, and makes
it possible for loops with different tempos to play together or to coexist at a consistent tempo without falling out of sync.
Ketron live drums for example use real audio drum samples, using loop slicing each drum note or drum
beat sample can be triggered by the keyboard this is why their drums sound so good. this is much easier to
implement than guitar loops because drums never change key
Ketrons new technology of using instrument audio loops is much more difficult because of the number of chord variations
involved.As Barry already mentioned different chord shapes or samples are mapped accross the entire keyboard
range as required and can be assigned to be triggered by a specific key or note.
This is why the Audya sounds are very realistic it is using real audio samples.
The thing that interests me most about Peters Direct Note access software is imaging recording an audio file which
contains playing mistakes These playing mistakes can now be corrected using an audio midi like piano roll editor without the need for Cubase, Cakewalk or other sampling editor software - AMAZING
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http://www.esnips.com/web/Songs