[squeak-dev] Sound mixing makes nasty noises

Herbert K├Ânig herbertkoenig at gmx.net
Tue Dec 29 20:09:36 UTC 2020

Hi Tim, Hi Eliot,

Eliot our problem is on the Pi only, not on Windows10 not on Linux Mint
and I think Tim uses Mac Os w/o these problems. 5.3 release Squeak here too.

I created a fullscale sine and a 1.01 * fullscale sine in Audacity
(cross platform audio editor) on the Pi, saved them as 16 Bit Wav and
read them again -> all as expected. But Audacity was a bit unclear if it
used Pulse or Alsa.

Next I'll create these sines in Python where I hope to have more control
over the audio drivers.



Am 29.12.2020 um 20:49 schrieb tim Rowledge:
>> On 2020-12-29, at 11:03 AM, Eliot Miranda <eliot.miranda at gmail.com> wrote:
>> Hi Herbert, Hi Tim,
>>      I suspect I've made a mistake somewhere.
> Well, I guess that happens occasionally - but I should note that my experiments are using a 5.3 release image (though I have tried the fairly up to date 6alpha stream as well). and so don't have your change involved.
> Herbert - the  prim to play the sound simply passes pointers around and I can't find any place where values might get changed. Given that both ALSA and pulseaudio allow setting of the sample format in order to handle 8, 16, 32 bt, integer and float, compressed, spindled, folded and mutilated, it is certainly possible there is an issue, though finding it will be 'fun'.
> One thing I should do is dig out another Pi and set it up with a clean 'last before pulse' copy of the OS and make sure we know what happens in that case.
> So many things to break, so little time...
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> The world is not magic

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