[gmpi] Re: Parameters / controls / GMPI event system - refreshment

On Sun, Dec 04, 2005 at 08:46:58AM +1300, Jeff McClintock wrote:
> >>Isn't the easiest solution to re-use a VID?
> >>
> >>Note-On VID 0  G4
> >>Note-On VID 0  G4
> >>Note-On VID 0  G4
> >>Note-On VID 0  G4
> >
> > Again, this solves *this* problem but breaks the truly polyphonic mode of
> > operation.  How do you reconcile that?
> 
> I'm saying the point of VID is that they give the *sender* the choice:

And I think the sender owning the decision is wrong - it's dependant on
the patch.  HOWEVER - you make an interesting use case here.

> This score requires a solo trumpet...
> 
> Note-on VID 0  G4
> ...
> Note-on VID 0  G4
> ...
> Note-on VID 0  A4
> 
> This score requires a trumpet trio
> 
> Note-on VID 0  G4
> ...
> Note-on VID 1  G4
> ...
> Note-on VID 2  A4
> 
> Same patch, same notes, different *intention*.

Right.  But if the trumpet patch you use doesn't support polyphony
(because hey - it's a trumpet), then these two are the same, regardless of
your intentions.

> Yes I agree, a piano patch, fed a non-challenging score could figure out 
> which voices to allocate.
>   A guitar however can't, each string supports an overlapping range of 
> pitches, each string is independently bendable, power-chords 
> deliberately use the same pitch on two strings.
> 
> A guitar-synth needs explicit help allocating pitches to the correct 
> string...

We've already established that guitar synths are special, and a reasonable
answer is to do 1 string per channel.

> The musician can switch-off keyboard-style VVID allocation.
> 
> He should have a range of possible VVID assignments schemes including:
> -keyboards score mode
> -solo score
> -one-voice-per-note-in-the-score-mode

OK.  I think already said this, but this sounds fine to me.  The host can
provide this explicit VPID re-use (as a feature).  This isn't part of the
spec, I think, but a good thing to have worked out.

Tell me if this sounds right, just as an example, sticking with the above
use case:

This score requires a solo trumpet.  The host sequences notes that are
explicitly tied together, somehow.  The user explicitly connected the
notes.

Note-on VPID(0)  G4
Note-on VPID(0)  G4
Note-on VPID(0)  A4

This score requires a trumpet trio.  The host sequences individual notes.

Note-on VPID(0)  G4
Note-on VPID(1)  G4
Note-on VPID(2)  A4

> ALL GMPI synths should respond the same simple way:
> -new VVID     = assign new real-voice
> -re-used VVID = re-use real voice  (internal voice limit allowing)
> 
> That's my take anyway.

This is the only thing I disagree with - re-using a VPID is a suggestion
to the plugin about the relationship between voices.  The plugin can
choose to re-use the real voice or not, as it makes sense.  The example
trumpet synth above would choose to re-use voices with re-used VPIDs.

Does that taint your model too much?

I'm still working on an animation.

> thockin@xxxxxxxxxx wrote:
> >On Sat, Dec 03, 2005 at 06:56:41PM +1300, Jeff McClintock wrote:
> >
> >>floorf(pitch) on the 2nd note to determinin which (real) voice to steal.
> >>
> >>What if I'm using a micro-tonal scale with say 24 pitches per octave ( 
> >>0.5 semitones per key).
> >>
> >>Won't your scheme steal the wrong voice?
> >
> >
> >It might, but if you are using a microtonal scale you sould have to
> >substitute your own function for floorf() to round to the nearest pitch.
> >
> >
> >>Isn't the easiest solution to re-use a VID?
> >>
> >>Note-On VID 0  G4
> >>Note-On VID 0  G4
> >>Note-On VID 0  G4
> >>Note-On VID 0  G4
> >
> >
> >Again, this solves *this* problem but breaks the truly polyphonic mode of
> >operation.  How do you reconsile that?
> >
> >Tomorrow I'll get a better animation of what I mean, and I think you'll
> >all say "oh! that's what he meant."
> >
> >Tim
> >
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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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