I'm aware that this is what happens what a filter is set at a negative value, and I guess from this example that the same thing happens at high filter values. (Maybe the value is looping?) I've never noticed this problem when the filter is keep > 0 and < 10000, so I think you can avoid it like that until a fix is given. But yes, the resulting sound is always at max volume.<br>
<br><div class="gmail_quote">On Sat, Nov 28, 2009 at 11:09 AM, Tomasz Kaye's brain <span dir="ltr"><<a href="mailto:tomasz.brain@gmail.com">tomasz.brain@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hello all. I know that Kassen already posted to the list about (what<br>
seems like) a filter instability problem in certain situations. But<br>
after a conversation with him it seemed that I hadn't conveyed the<br>
full nature of the problem clearly, so in this post will try to do<br>
that.<br>
<br>
To recap, here's some code from Kijjaz that demonstrates the problem:<br>
<br>
PulseOsc osc => BPF filter => blackhole;<br>
20000 => filter.freq;<br>
0.5 => filter.Q;<br>
for(int i; i < 100; i++)<br>
{<br>
<<< "osc: ", osc.last(), " filter: ", filter.last() >>>;<br>
samp => now;<br>
}<br>
<br>
The value output by the filter keeps rising.<br>
<br>
I ran into this problem while i had a similar patch connected to dac<br>
instead of to a blackhole. I was wearing headphones, but i took the<br>
usual precaution of turning my macbook volume to the lowest level<br>
above 0 before running the patch. To my alarm, the resulting screaming<br>
sound came through my headphones at top volume anyway. It turns out<br>
that when set to any of the volume gradations above 0, the screaming<br>
happens at effectively full volume on my macbook.<br>
<br>
So the point of this extra post is to emphasise that (at least for mac<br>
users) the filter screaming issue is currently quite dangerous for<br>
hearing/speakers, even if you take (imo) normal sensible precautions<br>
before running a patch.<br>
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</blockquote></div><br><br clear="all"><br>-- <br>David M<br>