19 Dec
2002
19 Dec
'02
3:07 p.m.
What frequency does PITCH 0.0 correspond to?
I assume this should be a fixed value, as "system finetune" can be
implemented in other ways. No need to have all synths keep track of
yet another parameter to convert PITCH into whatever they need.
440 Hz? :-)
(Who the h*ll came up with the idea that *C* starts the octave!? What
a horrible frequency to remember...)
Nah - I guess we should stick with the conventional "middle C", like
everyone else. I guess most synths and software use 440 Hz for A4 by
default. That's 261.6255653 Hz for C4. Nice value... *heh*
//David Olofson - Programmer, Composer, Open Source Advocate
.- The Return of Audiality! --------------------------------.
| Free/Open Source Audio Engine for use in Games or Studio. |
| RT and off-line synth. Scripting. Sample accurate timing. |
`---------------------------> http://olofson.net/audiality -'
--- http://olofson.net --- http://www.reologica.se ---
19 Dec
19 Dec
4:43 p.m.
On Thu, Dec 19, 2002 at 08:01:57 +0100, David Olofson wrote:
What frequency does PITCH 0.0 correspond to?
I assume this should be a fixed value, as "system finetune" can be
implemented in other ways. No need to have all synths keep track of
yet another parameter to convert PITCH into whatever they need.
I think that is actually a good way of implementing global tuning. It
would be good to let the host provide the figure and the instruments can
just pick it up. There may be reasons for particular values in particular
hosts or styles. We could recommend Concert A as a default, as thats how
most synths are tuned in my experience.
Modular synth style modules generally ignore the global tuning anyway.
They have there own 0.0v -> Hz mapping, set via a dial.
I dont see any point in specifying it as middle C.
- Steve
5:27 p.m.
On Thursday 19 December 2002 21.38, Steve Harris wrote:
On Thu, Dec 19, 2002 at 08:01:57 +0100, David Olofson
wrote:
Yeah, that's what I was thinking as well, but I don't quite like the
extra "+ global_tuning" whenever you're doing pitch->frequency
conversion... Especially since you might as well have a "TUNING"
control on sequencers, scale converters or whatever you're using.
What frequency does PITCH 0.0 correspond to?
I assume this should be a fixed value, as "system finetune" can
be implemented in other ways. No need to have all synths keep
track of yet another parameter to convert PITCH into whatever
they need.
I think that is actually a good way of implementing global tuning. It would be good to let the host provide the figure
and the
instruments can just pick it up. There may be reasons for
particular values in particular hosts or styles. We could recommend
Concert A as a default, as thats how most synths are tuned in my
experience.
Modular synth style modules generally ignore the global tuning
anyway. They have there own 0.0v -> Hz mapping, set via a dial.
Well, we don't need to deliberately disconnect some kinds of plugins
from global tuning, do we? ;-)
I dont see any point in specifying it as middle C.
No, anything works. Better have nice values, like 440 and 435.
//David Olofson - Programmer, Composer, Open Source Advocate
.- The Return of Audiality! --------------------------------.
| Free/Open Source Audio Engine for use in Games or Studio. |
| RT and off-line synth. Scripting. Sample accurate timing. |
`---------------------------> http://olofson.net/audiality -'
--- http://olofson.net --- http://www.reologica.se ---
20 Dec
20 Dec
7:54 a.m.
On Thu, Dec 19, 2002 at 10:21:58 +0100, David Olofson wrote:
Well, no, thats why I said 'ignore'.
- Steve
On Thursday 19 December 2002 21.38, Steve Harris
wrote:
Yeah, I guess it would be ok to have it as a control.
On Thu, Dec 19, 2002 at 08:01:57 +0100, David
Olofson wrote:
Yeah, that's what I was thinking as well, but I don't quite like the
extra "+ global_tuning" whenever you're doing pitch->frequency
conversion... Especially since you might as well have a "TUNING"
control on sequencers, scale converters or whatever you're using. What frequency does PITCH 0.0 correspond to?
I assume this should be a fixed value, as "system finetune" can
be implemented in other ways. No need to have all synths keep
track of yet another parameter to convert PITCH into whatever
they need.
I think that is actually a good way of implementing global tuning. Modular synth
style modules generally ignore the global tuning
anyway. They have there own 0.0v -> Hz mapping, set via a dial.
Well, we don't need to deliberately disconnect some kinds of plugins
from global tuning, do we? ;-) 
19 Dec
19 Dec
6:03 p.m.
On Thu, Dec 19, 2002 at 08:01:57PM +0100, David Olofson wrote:
What frequency does PITCH 0.0 correspond to?
unadjusted pitch, A4 = 440 Hz
for a PITCH of +1.0 one octave up, -1.0 one octave down etc.
F[pitched] = F[orig] * (2 ^ PITCH)
or, for those who prefer to specify the number of notes:
PITCH = ((2 ^ (1/12)) ^ note)
Frank.
--
+---- --- -- - - - -
| Frank van de Pol -o) A-L-S-A
| FvdPol(a)home.nl /\\ Sounds good!
| http://www.alsa-project.org _\_v
| Linux - Why use Windows if we have doors available?
6:10 p.m.
On Thursday 19 December 2002 23.01, Frank van de Pol wrote:
On Thu, Dec 19, 2002 at 08:01:57PM +0100, David
Olofson wrote:
Yeah, that was my first thought. Make 0.0 <==> 440 Hz, period.
It has been suggested that it be a "system variable" or something,
but since we have linear pitch control anyway, you may as will
implement it as an optional TUNING control input on the plugins that
care. (Sequencers with direct PITCH output and scale converters would
care.)
//David Olofson - Programmer, Composer, Open Source Advocate
.- The Return of Audiality! --------------------------------.
| Free/Open Source Audio Engine for use in Games or Studio. |
| RT and off-line synth. Scripting. Sample accurate timing. |
`---------------------------> http://olofson.net/audiality -'
--- http://olofson.net --- http://www.reologica.se ---
What frequency does PITCH 0.0 correspond to?
unadjusted pitch, A4 = 440 Hz
20 Dec
20 Dec
7:55 a.m.
On Thu, Dec 19, 2002 at 11:04:46 +0100, David Olofson wrote:
On Thursday 19 December 2002 23.01, Frank van de Pol
wrote:
No, not optional, mandatory. I think this would be a much easier way to
ensure that global tuning works than having the sequencers/midi
converters skew thier note->pitch outputs.
- Steve
On Thu, Dec 19, 2002 at 08:01:57PM +0100, David
Olofson wrote:
Yeah, that was my first thought. Make 0.0 <==> 440 Hz, period.
It has been suggested that it be a "system variable" or something,
but since we have linear pitch control anyway, you may as will
implement it as an optional TUNING control input on the plugins that
care. (Sequencers with direct PITCH output and scale converters would
care.) What frequency does PITCH 0.0 correspond to?
unadjusted pitch, A4 = 440 Hz
21 Dec
21 Dec
12:23 p.m.
On Friday 20 December 2002 12.50, Steve Harris wrote:
On Thu, Dec 19, 2002 at 11:04:46 +0100, David Olofson
wrote:
Why would you care if you take PITCH and output PITCH? (Event
processors.)
On Thursday 19 December 2002 23.01, Frank van de
Pol wrote:
No, not optional, mandatory. On Thu, Dec 19, 2002 at 08:01:57PM +0100, David
Olofson wrote:
Yeah, that was my first thought. Make 0.0 <==> 440 Hz, period.
It has been suggested that it be a "system variable" or
something, but since we have linear pitch control anyway, you may
as will implement it as an optional TUNING control input on the
plugins that care. (Sequencers with direct PITCH output and scale
converters would care.) What frequency does PITCH 0.0 correspond to?
unadjusted pitch, A4 = 440 Hz I think this would be a much easier
way to ensure that global tuning works than having the
sequencers/midi converters skew thier note->pitch outputs.
Yes, but then *everyone* has to implement it. No big deal, probably,
but it's still an extra parameter that (almost) everyone has to deal
with.
//David Olofson - Programmer, Composer, Open Source Advocate
.- The Return of Audiality! --------------------------------.
| Free/Open Source Audio Engine for use in Games or Studio. |
| RT and off-line synth. Scripting. Sample accurate timing. |
`---------------------------> http://olofson.net/audiality -'
--- http://olofson.net --- http://www.reologica.se ---
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linux-audio-dev@lists.linuxaudio.org
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participants (3)
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Steve Harris