|
Forum Index | Read LUG: Policy/Rules Messages Threads Digests | Post New Message | Search!
OK, here is a low-level technical problem for all you tech-heads. Since I'm
not really sure if this is Translator's (the conversion software by
Chickensys) or EXS-24's "fault", I'll just post it here anyway.
I just bought the Pro Samples Classic Orchestra CD-ROM a couple of days ago.
To my surprise, there was a really nasty click in the beginning of (almost)
all samples that were looped. Even stranger was that I could not see this
click in the sample editor - in fact, as I later found out, the click was
indeed not in the samples themselves, but "added" by EXS-24. By
moving the
sample start forward exactly 32 samples, the click disappeared. It seemed
that the sample editor and the numerical values in the instrument zones were
off by 32 bytes.
Before investigating this matter any futher, I converted a couple of my old
Roland CD-ROM's into EXS-24 format with Translator. Surprise - the clicks
were back again in looping sounds! This time not in the beginning of the
sample, but instead in the end where the loop ends (and starts). Again, the
clicks were "virtual", not in the sound data themselves.
That was it - I decided to check what is going on.
I was able to construct a non-clicking version of the clicking instruments
by simply creating a new instrument and adding the samples, zones &
groups
to it. After a while I had two instruments with exactly the same filesize,
and looking exactly the same in EXS-24's instrument editor - still, another
one of them clicked, another one did not.
After a lot of hex-editing, perl-ing and investigating the .exs instrument
files, I found one byte that seems to cause all these clicks. An EXS-24
instrument file consists of chunks that always begin with the string
"TBOS"
(or sometimes "SOBT" ?). One chunk defines for example one zone,
group or
reference to a sound file. The beginning of a sound file reference chunk
looks like this:
4 bytes - the ascii string "TBOS" or "SOBT"
64 bytes - the name of the wav or aif file, padded with zeros
1 byte - the mystery byte!
So far I have seen at least 4 different values for this byte (in decimal)
when examining different instruments: 0, 44, 88, and 112. With the latest
conversions I made with Translator, it seemed to be always 112, which caused
the click. I tried changing this to 44 in a couple of instruments, and that
removed the click. However, with the Classic Orcestra sounds, the value was
already 44, and 112 removed the click!
At this point it was getting a little confusing, so I thought it might be a
good idea to ask if anyone knows anything about this. Like I said, I don't
know if there is a bug somewhere and where it is, but if someone from Emagic
or Chickensys (you are probably reading this list too?) could tell me the
function of this byte, I can do the rest (hopefully possible bugs will be
fixed too..). I'm in the middle of a big project right now, and _really_
need these instruments ASAP, preferably with no clicks. :)
Markus "Captain" Kaarlonen
Lead Web Developer - www.madonion.com
captain@...
Markus Kaarlonen wrote:
> OK, here is a low-level technical problem for all you tech-heads. Since
I'm
> not really sure if this is Translator's (the conversion software by
> Chickensys) or EXS-24's "fault", I'll just post it here
anyway.
<snip>
Wow! I was just about to email ChickenSys about exactly this problem too!
In this case, Translating from an old Roland CD to EXS on Mac, some samples
end up with the buzz that you describe. Some do not!
I haven't gone into nearly as much depth as you have (complete respect!),
but I can certainly confirm having the same issue.
I just hope that it gets solved quickly enough for you - it's not an issue
for me yet.
Good luck...
--
The best of times to you all...
Pants
From: "Markus Kaarlonen" <markus.kaarlonen@...>
> OK, here is a low-level technical problem for all you tech-heads. Since
I'm
> not really sure if this is Translator's (the conversion software by
> Chickensys) or EXS-24's "fault", I'll just post it here
anyway.
>
> I just bought the Pro Samples Classic Orchestra CD-ROM a couple of days
ago.
> To my surprise, there was a really nasty click in the beginning of
(almost)
> all samples that were looped. Even stranger was that I could not see
this
> click in the sample editor - in fact, as I later found out, the click
was
> indeed not in the samples themselves, but "added" by EXS-24.
By moving the
> sample start forward exactly 32 samples, the click disappeared. It
seemed
> that the sample editor and the numerical values in the instrument zones
were
> off by 32 bytes.
<snip>
Hi Markus,
It's been emntioned here several months back that there were some problems
in using the Pro Samples CD-ROMs with the EXS-24.
There were also problems with some of the looping as well as some problems
with the tuning being altered pretty radically. I have several of the Pro
Samples CDs here and if I remember, 'The World Instruments' CD was one of
the ones that was mentioned as having problems.
You're the first I've heard of looking into the details of it...
Danny
Yes, Roland xfers do have a click, even when the loop is set to the
same numbers in EXS as the original, but a few millisecond xfade will
deal with it without any damage to the sound. Regards Brian
Brian Gascoigne <brian@...>wrote:
Yes, Roland xfers do have a click, even when the loop is set to the
same numbers in EXS as the original, but a few millisecond xfade will
deal with it without any damage to the sound. Regards Brian
i hope i'm posting right, i'm not really sure
but i get those clicks with certain sample cd conversions........i solve the
problem quickly by changing start frame for each exs zone to "1"
rather than "0"......provided thats where it all begins, at 0 by
default
Forum Index | Read LUG: Policy/Rules Messages Threads Digests | Post New Message | Search! Forum Index | Read LUG: Policy/Rules Messages Threads Digests | Post New Message | Search! © 1994-2008, All Rights Reserved. |