Re: Web Audio API spec: readonly & LFO

Ah, yes.  Detune on filters is pretty new.


On Thu, Feb 28, 2013 at 10:40 AM, Ashley Gullen <ashley@scirra.com> wrote:

> 1) I worked on repro'ing this, and it turns out it's just iOS hasn't
> implemented the 'detune' member of BiquadFilterNode yet... oops. Still, the
> iOS JS engine gave me a "can't set readonly" error for some reason, and I
> got confused by the terminology (I assumed it was like C++ where a const
> member cannot be modified at all). Probably my bad to assume.
>
> 2) Thanks Chris, I see now - I missed the part in the spec where it says
> it mixes the oscillator with the already set value. That does the trick!
>
> So I guess there's no need to change the spec... just some feedback about
> where a random coder got tripped up.
>
> Ashley
>
>
>
> On 28 February 2013 18:12, Chris Wilson <cwilso@google.com> wrote:
>
>> Ah.  Then you set the delayTime parameter to 0.150 (center of your
>> 100ms-200ms range), and scale an LFO by running it through a gain node that
>> scales -1...1 to -0.050...+0.050 - by setting the gain.value to 0.050.
>>
>> var delayNode = context.createDelay();
>> var lfo = context.createOscillator();
>> var lfoGain = context.createGain();
>>
>> delayNode.delayTime = 0.150;
>> lfo.connect( lfoGain );
>> lfoGain.gain.value = 0.05;
>> lfoGain.connect( delayNode.delayTime );
>>
>>
>>
>>
>> On Thu, Feb 28, 2013 at 10:07 AM, Ashley Gullen <ashley@scirra.com>wrote:
>>
>>> But a gain node doesn't let you offset a value - a delay oscillating
>>> from -100ms to +100ms isn't much use since delays can't go negative, what
>>> if you need a delay oscillating from 100ms to 200ms?
>>>
>>>
>>> On 28 February 2013 17:56, Matt Diamond <mdiamond@jhu.edu> wrote:
>>>
>>>> I can't speak to point #1, but I'll just say that in terms of creating
>>>> an LFO, I assume the usual method is Oscillator --> GainNode -->
>>>> AudioParam, which provides you with control over the amplitude of the LFO.
>>>>
>>>> Matt Diamond
>>>>
>>>
>>>
>>
>