Korg sampler options
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Korg sampler options
Can anyone explain a litte more on the meaning of the time stretch, and time slice funtions, what exactly do they do for the sample when editing on korg.
Korg Kronos 2,Korg Oasys 76, Korg 01W/fd, Korg im1 ipad, Korg Triton Extreme, Korg Triton Studio, Korg M3, Roland Integra 7, Yamaha Montage 7, Roland Fantom 6, Korg Nautilus, Korg PA4X, Korg Kross 2
Hi,
You want it to know exactly? Jump into DSP theory. (Filtering, decimation, upsampling, FFT, ...)
The shorter version is this:
Time stretch will change the length and hence the tempo of the sample while keeping the pitch the same as in the source sample. Playing a sample faster or slower will change the length but will not keep the the pitch. (Remember playing vinyl singles and LP at the wrong speed). So some algorithms come into action. Various approaches are possible. Typically straightforward solutions work very fine for tones with a clear pitch, but gets more difficult for the accents which lack a clear pitch (attacks, percussion like things, ...). Although these days algorithms are very good, some even run in real time.
Time slicing. This is intended for rythm patterns and can be seen as the solution for the problem indicated with the percussion like things. The algorithm detects the different phases of a beat (e.g. bass drum, snare pattern) and chops it up in small pieces each containing one beat. If you now want to change the tempo, the different pieces are just played sooner or later after each other exactly as recorded in the original sample. The pieces themself are not recalculted for holding pitch, because not needed, even not wanted. That is why this method only works fine for rythms (detecting pieces is simple, no need for recalculation).
Both methods can be real time (algorithms are run at the very moment you're playing it) or off-line, meaning, the method is run and generates a new sample that is stored and will be played back as such when selected by a key.
Typically, synth boards do the latter, because you don't have the real time constraint to fullfill and keeps also the available DSP power (max number of voices) predictable when playing the board.
Have fun.
You want it to know exactly? Jump into DSP theory. (Filtering, decimation, upsampling, FFT, ...)
The shorter version is this:
Time stretch will change the length and hence the tempo of the sample while keeping the pitch the same as in the source sample. Playing a sample faster or slower will change the length but will not keep the the pitch. (Remember playing vinyl singles and LP at the wrong speed). So some algorithms come into action. Various approaches are possible. Typically straightforward solutions work very fine for tones with a clear pitch, but gets more difficult for the accents which lack a clear pitch (attacks, percussion like things, ...). Although these days algorithms are very good, some even run in real time.
Time slicing. This is intended for rythm patterns and can be seen as the solution for the problem indicated with the percussion like things. The algorithm detects the different phases of a beat (e.g. bass drum, snare pattern) and chops it up in small pieces each containing one beat. If you now want to change the tempo, the different pieces are just played sooner or later after each other exactly as recorded in the original sample. The pieces themself are not recalculted for holding pitch, because not needed, even not wanted. That is why this method only works fine for rythms (detecting pieces is simple, no need for recalculation).
Both methods can be real time (algorithms are run at the very moment you're playing it) or off-line, meaning, the method is run and generates a new sample that is stored and will be played back as such when selected by a key.
Typically, synth boards do the latter, because you don't have the real time constraint to fullfill and keeps also the available DSP power (max number of voices) predictable when playing the board.
Have fun.
microKORGXL, Kaossilator Pro, monotribe, SQ-1, volca fm, Kross 88 BK
Alesis SR18, Akai Miniak, Fender Strat, Line 6 Spider II 112, Zoom MS-50G
Alesis SR18, Akai Miniak, Fender Strat, Line 6 Spider II 112, Zoom MS-50G