[Freepats] multilayer editing with swami

[Marcos Guglielmetti]

http://www.musix.org.ar/tmp/swami/steinway_imis_2_layers2007-07-01T.ogg

El Domingo, 1 de Julio de 2007 23:50, Roberto Gordo Saez escribió:
 | On Sun, Jul 01, 2007 at 04:57:18PM +0200, Marcos Guglielmetti wrote:
 | > Feel free to write me in english: I can understand it perfectly.
 | > My problems is that sometimes I dont have time to write in english.
 |
 | OK.
 |
 | > BTW: you did not made any loop to the samples into the sf2 file, why? I
 | > mean, I can understand tha we like HQ, but... from the 70% of the sound
 | > sample and up to the end you almost cant listen.
 |
 | Maybe you have some backgound noise on the room? I have a passive cooled
 | computer and on a silent room I can perfectly hear the sample to the end.
 | Try with a chord instead of a single note, I'm sure you will also be
 | able to hear full samples at a normal volume.
 
YesI hear them, but my idea was: do we need this? So, I am cutting at 20s when 
the sample is 40s and I think nobody will be 40 or 30s pressing a key... but, 
I dont know

 | Signal/noise ratio is very poor in the softer part, though. Using sorter
 | samples will help to avoid the noisy parts.
 |
 | > I can understand that this is the best for a HQ sf2, but in the future
 | > we could use some interesting loop methods, using "until release"  loop
 | > mode, and merging parts of the sample in the way tha we could make
 | > perfect loops, I will show you something like this if I could do it.
 |
 | Correct, loops are missing. Take a look at this mail by myself:
 |
 | http://opensrc.org/pipermail/freepats/2007/000117.html
 |
 | Choosing good loop points (in a way that they can't be noticed) takes
 | many time, and I'm lazy, so that is the main reason for no loops :-)
 
Sure, verdad. And for now I dont understand how Swami does it, I will see it 
in the future


 | > Also, the IMIS steinway sound samples are not normalized, I can also
 | > understand that the pp and mf layers must not sound with peaks of 0 db,
 | > but the FF layer I think it could do it.
 | >
 | > The problem with this issue is that in that case we will have to
 | > increase the overall volume, not just the FF layer... I will see.
 | >
 | > For instance, FF b2 needs 11.9 db to be at full volume, this will allow
 | > us to listen to the final sound at the end of the sound sample
 |
 | I've tried to use a tool called normalize-audio:
 |
 | http://normalize.nongnu.org/
 |
 | The result was not so good. I've made some research, and it seems that
 | an acoustic (non electric) piano is a very difficult instrument to
 | balance, because all parts (attack, sustain...) may require different
 | gain levels. It looks that some professional (and expensive) piano
 | soundfounts are normalized by applying a custom amplitude envelope to
 | each individual sample, balanced by ear in comparison with all the other
 | notes. That's a lot of work!
 |
 | I've opted to just apply a certain gain to each sample and forgot about
 | this issue for now. It is far from perfect. You can find the samples
 | I've used here:
 |
 | http://freepats.opensrc.org/sf2/acoustic_piano_imis_samples/
 
Used...

 | They are cropped, but before applying the gain. I think you could start
 | from scratch anyway, since very little is actually done. Now you can
 | understand why I've said the soundfont was only a demo, eh? :-)
 

I started from scratch because swami did not allowed me to save the work, so I 
started a new one and swami saved it into ~/Untitled.sf2

75mb, 2 layers, mf and ff

I needs much more work: 
http://www.musix.org.ar/tmp/swami/steinway_imis_2_layers2007-07-01T.ogg

 | Well... just try to make something better each time, and with enough
 | time we will end with a very good soundfont.
 |
 | > what do you think about this and  the other issues?
 |
 | Some samples contain "clicks" or other noises inside, try to avoid them
 | (look for my previous mails). Also, let me suggest you to keep a copy of
 | the processed samples used by you, but before they are normalized. They
 | would be useful if at a latter time we want to "renormalize" them in
 | other way.


Yes, I will do it, I never remove something like this.

Well... just some ours of work for now,I hope I (or we) could do ir better in 
the future.

I will compress the sf2 and upload it to: http://www.musix.org.ar/tmp/swami/

into a bz2 file (26mb)


La diferencia de timbre entre mf y ff es muy notable, y tampoco sé dónde 
situar exactamente el límite entre una y otra capa.

The difference between mf and ff is too high... 

Regards,
-- 
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