Topic by RobertS

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Topic: Velocity Curves and Midi Theory question

Hi,

Is it possible that different midi keyboards not only send data regarding velocity but also "attach" of each note?

When I play the Korg Oasys I just get a much more natural piano sound than the AKAI MPK88. It seems that the Oasys makes the sound rounder and fatter and hence more natural. I have the hunch that when playing around with the 8 velocity curves of the Oasys it does not only change the velocity curve but the "Attack" of the sound. High "Velocity Curves" produce a very fast attack (Moog Type sound) whereas lower "Velocity Curves" makes a slower attack.

Is that possible or theoretically impossible?

If it is impossible and hence no midi keyboard sends info about the "attack" I should be able to replicate with the Pianoteq those velocity curves of the Oasys and achieve the same sound with another Keyboard.

Thanks for your help!

Reply by EvilDragon

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Re: Velocity Curves and Midi Theory question

What you hear is not entirely keybed related, it's the synthesis of the board that makes it possible. It's simply the amount of envelope attack time modulation which responds to keyboard velocity - so depending on how you set keyboard sensitivity, the envelopes will respond differently.

So, no, keyboards only transmit Velocity On (some also transmit Velocity Off), no "Attack" values are generated with keybeds.

Last edited by EvilDragon (09-03-2010 21:05)
Hard work and guts!

Reply by RobertS

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Re: Velocity Curves and Midi Theory question

So, it is possible to obtain exactly the same sounds when playing with different keyboards. It is just a matter of adjusting the velocity curve in Pianoteq for each keyboard.
Then all the presets I made playing the Oasys can be easily ported to other keyboards just adjusting the Velocity Curve in Pianoteq to match this of the Oasys.
Is that correct?

Reply by EvilDragon

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Re: Velocity Curves and Midi Theory question

Well, it's a tricky question. Adjusting velocity curves is not the easiest thing in the world. Needs a lot of adjustment. And I'm not sure if you would be able to get 1:1 sound simply by tweaking the velocity curve in Pianoteq. It responds completely differently than Oasys does. It might be a job in vain. On the other hand, you just might do it. BUT, you'd have to analyse the sensitivities of different keyboard actions IN RELATION to Pianoteq's response. That's definitely a LOT of work.

Hard work and guts!

Reply by RobertS

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Re: Velocity Curves and Midi Theory question

Thanks!. I will try;-)

Reply by sigasa

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Re: Velocity Curves and Midi Theory question

RobertS wrote:

Thanks!. I will try;-)

It's a lot of fun I can assure you. I have been working on the CP33 velocity curve for quite some time and have found it quite a learning experience. You may also need to adjust the dynamics slider in pianoteq also!

Last edited by sigasa (09-03-2010 23:20)

Reply by Jope

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Re: Velocity Curves and Midi Theory question

I think velocity curves are an approach which will work to a certain degree, but you have to work out how to play the different keyboard, too. Since it feels different as it responds mechanically different, your fingers won't perform the same dynamic relations in the beginning. Grow together with it!

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