[gmpi] Re: 3.17 Instruments
- From: "gogins@xxxxxxxxxxxx" <gogins@xxxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Mon, 16 Aug 2004 09:19:20 -0400
One use case would be simulating a violin stroke, where the player begins
to bow on one stop, then lifts a finger to another stop, so that the pitch
changes while the loudness and envelope remain the same (mostly). Legato,
yes. But there are many kinds of legato, and more can be invented with
software.
The basic requirement is that the "tie" instruct an instrument to change
pitch without re-initializing the instrument or performing a new attack.
More power would come from the ability to select which steps of
initialization to perform or not to perform in a tied note.
Original Message:
-----------------
From: Tim Hockin thockin@xxxxxxxxxx
Date: Sun, 15 Aug 2004 22:59:46 -0700
To: gmpi@xxxxxxxxxxxxx
Subject: [gmpi] Re: 3.17 Instruments
On Mon, Aug 16, 2004 at 12:20:16AM -0400, Michael Gogins wrote:
> This is good.
>
> What about "carry" -- i.e. slurs carrying from one note to the next
without
> hard articulation?
What is the requirement? I'm not clear on what you're asking for.
Legato?
> ----- Original Message -----
> From: "Tim Hockin" <thockin@xxxxxxxxxx>
> To: <gmpi@xxxxxxxxxxxxx>
> Sent: Sunday, August 15, 2004 11:50 PM
> Subject: [gmpi] Re: 3.17 Instruments
>
>
> > Last summary for Instruments?
> >
> >
> > Req 77: Instrument plugins should be fundamentally no different than
> > effects plugins. Any plugin that implements the instrument API can be
> > played as an instrument.
> >
> > More
> >
> > Instruments are just ordinary plugins which happen to implement the
> > necessary interfaces to be played as an instrument. They need to share
> > all the same infrastructure and APIs as GMPI effects and other
plugins.
> > They are not a separate API, but just a sub-API of GMPI.
> >
> > Instruments are not necessarily output only. They can have audio
inputs,
> > and can act as effects or controllers, too.
> >
> > Req 78: GMPI must provide a note control mechanism. This must
include,
> > at minimum, the ability to turn specific notes on and off.
> >
> > Req 79: GMPI must support fractional pitch numbers.
> >
> > More
> >
> > The GMPI working group seemed to converge on a model of MIDI-like
pitch
> > numbers, but represented as real numbers rather than integers. This
is
> > compatible with existing standards.
> >
> > Req 80: Voice management must be the domain of the instrument. All
that
> > the host sees is a voice ID. Operations on a voice always use the ID.
> >
> > More:
> >
> > A system must be developed for voice management that leaves the actual
> > control of voices to the instrument, while giving the host enough
> > flexibility. By using voice IDs that are not directly tied to physical
> > voices, we an allow the same note to be triggered multiple times on an
> > instrument, and still have each instance of the note be managed
> > individually.
> >
> > Req 81: GMPI must provide the ability for an instrument to define an
> > arbitrary set of parameters that applies to each voice. These parameters
> > must be able to indicate whether they apply only to the start of a voice
> > (e.g. velocity) or whether they apply continuously to the voice (e.g.
> > aftertouch).
> >
> > More:
> >
> > GMPI can also move forward by allowing arbitrary parameters to apply
to
> > each voice. Traditional MIDI systems have a small number of parameters
> > that can operate on each voice, such as velocity and aftertouch. Those
> > limits do not need to apply to GMPI. By allowing the instrument to
> > define parameters which can be set at the start of a note (such as
> > velocity) and parameters that can be modified during the lifetime of
> > the note (such as aftertouch), we put the choice in the hands of the
> > developer.
> >
> > ----------------------------------------------------------------------
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> >
> >
>
>
>
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--
Tim Hockin
thockin@xxxxxxxxxx
Soon anyone who's not on the World Wide Web will qualify for a government
subsidy for the home-pageless.
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