Re: Fading sound in and out

... this is my favourite behaviour for the fading play/stop (wish I could do this is one line).
  http://jsfiddle.net/NorbertSchnell/ot61j1ue/
N.

On 26 Aug 2014, at 12:04, Norbert Schnell <Norbert.Schnell@ircam.fr> wrote:
> The current behaviour of the "xxxToValueAtTime" and the code that it requires is really not that great.
> 
> In Chinmay's example it causes clicks as he describes and in Chris' example causes clicks when clicking "play" during the fadeout or "stop" during the fadein.
> 
> What I would expect is that calling the function "linearRampToValueAtTime" would use the current value at current time as a start point and ramp from there to the given value at the given time. In that case the fade times are always respected (even though the slopes wouldn't).
> I could not think of any scenario in which this behaviour would not be desired, do you?
> 
> Norbert
> _____________________
> N o r b e r t   S c h n e l l
> { Sound Music Movement } Interaction
> IRCAM – Centre Pompidou
> 
>> Actually, your problem is you're not setting the start point for the linear
>> ramp appropriately; you setValueAtTime(0) when the context is created, But
>> you need to additionally set it when the play or stop button is pressed (to
>> give it a start value and (more importantly) time for the ramp.  See
>> 
>> http://jsfiddle.net/9La05fg5/11/
>> .
>> 
>> What's happening now is whenever the click methods are called, the start
>> time and value for the ramp is whatever the last schedule event was - e.g.,
>> if you loaded the page and waited three seconds, then clicked play, the
>> linear ramp will have its start point (value 0) set on creation - 3 seconds
>> in the past - and the end point is three seconds in the future (value 1) -
>> so it will immediately jump to 0.5, and ramp from 0.5 to 1 over the next 3
>> seconds, which is why it's not smooth enough.
>> 
>> I really need to write an explanatory article about how to use the
>> scheduler.
>> 
>> On Wed, Aug 20, 2014 at 9:43 AM, Chinmay Pendharkar <notthetup@gmail.com> wrote:
>>> Hello,
>>> 
>>> You can look at using the exponentialRampToValueAtTime or setTargetAtTime methods
>>> instead.
>>> 
>>> Human perception of loudness is logarithmic in nature, so exponential
>>> decays of loudness feel 'smoother' to us than linear decays.
>>> 
>>> -Chinmay
>>> 
>>> 
>>> On Wed, Aug 20, 2014 at 10:29 PM, Yehonathan Sharvit <viebel@gmail.com> wrote:
>>> 
>>>> Hi,
>>>> 
>>>> What is the best way to fade sound in and out?
>>>> 
>>>> I tried to achieve that by calling linearRampToValueAtTime (see a demo:
>>>> 
>>>> http://jsfiddle.net/viebel/9La05fg5/7/
>>>> ) on a gain node but the effect
>>>> was not smooth enough?
>>>> 
>>>> How could I make it smoother?
>>>> 
>>>> Thanks,
>>>> Yehonathan.
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