Hi Dave,

Just a quick answer, you can do:

p3 = p3 + 10

or whatever value at the start of the instrument.  It'll have to be
all itime values.   However, I found that this was problematic with
blueX7 in the past and removed it though I don't know if that problem
has been fixed. (Something to do with turning off the notes, it would
spike the CPU).

steven


On 8/19/07, Dave Seidel <dave@superluminal.com> wrote:
> Hi all,
>
> I'm having loads of fun with the mode opcode, which I'm using to make
> some very nice bell-like sounds (currently using the set of ratios for
> the 140mm Tibetan bowl[1]).  As a mode newbie, I have a couple of
> questions....
>
> 1. Q values -- Is there any rule of thumb for coming with these?  In the
> absence of any better idea, I've been going the 1/pitch-ratio, and the
> results are pretty good, but I'd love to know of there's a better approach.
>
> 2. "Natural" decay -- Since I'm working with bell-type sounds, it feels
> wrong to specify the duration of a note.  What I really want to do it is
> to allow the note to decay "naturally", like a physical object that is
> struck.  For now, I'm using the technique of allowing "extra" time in
> p3, and overlapping the notes (i.e, starting the next note before the
> previous note's time is up.  I guess this leads to two questions: First,
> is there any algorithm I can use to derive the resonance time (the
> manual states that "[t]he resonance time is roughly proportional to
> kQ/kfreq", but I'm not sure how to apply that).  Second, is there a
> technique for a Csound instrument to modify it's own duration other than
> "ihold", e.g, can I modify p3 within the instrument itself?
>
> - Dave
>
> [1] http://csounds.com/resources/modalFreqs.html
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