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Change attack & release on PCM sounds?

 
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Kyoto92



Joined: 23 Nov 2021
Posts: 35

PostPosted: Tue Feb 08, 2022 6:52 am    Post subject: Change attack & release on PCM sounds? Reply with quote

Hi everyone,

Is it possible to change to change the attack and release (and other parameters such as cutoff) on the PCM sounds? I really like lofi-ish organ sounds with long decay and wonder if the microkorg XL+ is a good fit.
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OpAmp
Platinum Member


Joined: 07 Jun 2013
Posts: 1173
Location: Brussels, BE

PostPosted: Tue Feb 08, 2022 9:30 pm    Post subject: Reply with quote

Hi,

Yes that is perfectly possible.

When using a PCM, you actually replace an oscillator waveform by a sample player. The rest of the signal chain remains as is (mixer, filters, VCA, effects).
Even better, the PCM samples have some looping point built in so that they don't decay (immediately) and can sound forever.
E.g. for a piano sound or a bell sound you actually need to setup a proper VCA envelope (decay, sustain, release) to make it sound as the accoustic instrument itself. Otherwise, only the start of the sample is recognizable.
Changing the attack is more problematic for typical instrument sounds as piano and bell, because it affects the intro of the sample and can cut away the characteristic onset of a note.
Now real organs don't really have outspoken decay or release, so a simple rectangular envelope gets you started already.

Note:
* the samples are not too bad, but don't expect the best quality. E.g. the piano is not a grand multi sample velocity layered thing.
* take care with long releases. As the board has only 8 voices, at some point in time notes in the release stage will be cut and replaced for new notes coming up. It depends a bit what you understand under long and how complex your sound programming is. (E.g. two timbres, unison, a lot of movement, mono vs poly) Depending on that 8 voices can be a limitation or not if the cut voice is already quite low in amplitude and burried in the other voices.


Have fun.
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Kyoto92



Joined: 23 Nov 2021
Posts: 35

PostPosted: Wed Feb 09, 2022 5:54 am    Post subject: Reply with quote

OpAmp wrote:
Hi,

Yes that is perfectly possible.

When using a PCM, you actually replace an oscillator waveform by a sample player. The rest of the signal chain remains as is (mixer, filters, VCA, effects).
Even better, the PCM samples have some looping point built in so that they don't decay (immediately) and can sound forever.
E.g. for a piano sound or a bell sound you actually need to setup a proper VCA envelope (decay, sustain, release) to make it sound as the accoustic instrument itself. Otherwise, only the start of the sample is recognizable.
Changing the attack is more problematic for typical instrument sounds as piano and bell, because it affects the intro of the sample and can cut away the characteristic onset of a note.
Now real organs don't really have outspoken decay or release, so a simple rectangular envelope gets you started already.

Note:
* the samples are not too bad, but don't expect the best quality. E.g. the piano is not a grand multi sample velocity layered thing.
* take care with long releases. As the board has only 8 voices, at some point in time notes in the release stage will be cut and replaced for new notes coming up. It depends a bit what you understand under long and how complex your sound programming is. (E.g. two timbres, unison, a lot of movement, mono vs poly) Depending on that 8 voices can be a limitation or not if the cut voice is already quite low in amplitude and burried in the other voices.


Have fun.


Thanks for the elaborated reply! Yeah I know note stealing could be an issue on long releases. I have a Minilogue xd and manage with it, but Sometimes I need 5-note chords and that's kind of an issue with the minilogue.
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