MIDICraft's MIDINET CD-ROM/MIDICraft's MIDINET CD-ROM.iso/KORG_I-S/INTERNET/07057.006

Internet Message Format | 1997-04-28 | 3KB

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Date: Mon, 28 Apr 1997 13:59:28 +0100
From: "Luis B. Almeida" <[e-mail]>
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Subject: Re: disappointed with 15S
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Peter Ihnat wrote:
>
> Hi Luis and korg-i,
> Just catching up with a few emails.
>
> The i3, i4 and i5 all have 6Meg PCM.  i1 has 14M and i2 has 8M.  The i2
> uses the extra 2M for a piano sound which takes advantage of the longer
> keyboard (76 notes).  The i1 has a longer keyboard still (88 notes) but
> I have no info on what the extra 8M PCM covers.  Possibly more samples
> for the extra octaves of the keyboard and/or extra samples per sound??
>
> i1 - i4 all have 192 programs + 6 drum programs in ROM.  The i5 has 320
> programs + 14 drum programs.
>
> The conclusions:
> *i2-i4 are basically the same except i2 has a more extensive piano
> sample.
> *i1 must be incredible since it has 8M extra PCM but same number of
> programs.
> *The i5 must be the poor cousin since it has 128 more sounds + 8 more
> drum kits but still only 6M PCM.
>
> Regards
> Peter Ihnat
>
> PS Try using one of the effects (like ENHANCER, etc) to boost the octave
> you're having trouble with.

Hi Peter and everybody,

You were on the right track, when you suggested the reasons for the
lower quality of the i5S's sounds. Although there is no one-to-one
correspondence between programs and PCM sounds, the fact is that the i5S
has both a larger number of programs and a larger number of PCM sounds
in ROM. I've played a bit with the 'Oscillator sound' parameter in sysex
data and found that the i5S has 340 PCM sounds in ROM, although they
say, in the manual, that it has only 154 like the i3. It looks as if
they made the sysex description for the i5S manual by editing the
description of the i2/i3, and did it in a hurry. There are several
references to the i2/i3 there and, as we see, also some information that
was not updated.

Due to the larger number of sounds in the same 6MB ROM size, they must
use fewer samples per sound, so each sample must cover a wider section
of the keyboard. This must cause more noticeable timbre discontinuities
across the keyboard. These timbre jumps are certainly noticeable in the
piano, as well as in some other sounds. I still maintain, however, that
there is no reason for the existence of a section of the keyboard where
the piano sounds get softer. Equalising sound intensity beforing putting
the data in ROM should have been easy. It looks like they were not too
careful in the preparation of the waveforms for the i5S's ROM.

Regards,

Luis B. Almeida