Subject: Re: [linux-audio-user] 8 oscillator ecasynth
From: Eric Dantan Rzewnicki (rzewnickie_AT_rfa.org)
Date: Fri Sep 03 2004 - 18:46:30 EEST
On Fri, Sep 03, 2004 at 03:28:47PM +0100, Steve Harris wrote:
> On Thu, Sep 02, 2004 at 12:57:05 -0400, Eric Dantan Rzewnicki wrote:
> > > > 3) possibly related to 2) ... There are artifacts and glitches in the
> > In the docs you mention that the Hz control is not interpolated. Any
> > chance that could be added? Is it something a novice programmer could
> > try to take a whack at with a little guidance? or is it fairly involved?
> Its pretty easy, at the top of the inner loop the frequency is set, but it
> should be changed so that its updated every 4 or 8 samples, linearly
> interpolating between the previous value and the new one.
>
> It may needa bit of tweaking, eg. applying a lowpass filter to the
> linearly interpolated parameter, but I think just linear is fine.
>
> Its about 4 or 5 lines of code and hot hard, but tricky to explain. I'l
> walk you through any problems, offlist if you want to try it.
That's encouraging. I'll see what I can do.
/var/tmp/swh-plugins-0.4.7$ grep -ri interp * | wc -l
236
I suppose I can find a few examples in there somewhere. :)
> > Are the value ranges for the warmth and stability controls 0.0-1.0?
> > I think I see in the code where warm is clamped:
> > osc->nyquist = fs * (0.47f - f_clamp(warm, 0.0f, 1.0f) * 0.41f);
> > but, can't make out just what happens with stability...
> Its a bit too icky to explain, yes thier both [0,1].
I'll take your word on that, then.
Thanks Steve,
Eric Rz.
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