| Thanks, Thorin,
I love ALL your Csound work. Inspiring.....
-dB
Dr. Richard Boulanger Professor of Electronic Production and Design
Berklee College of Music Professional Writing and Technology Division
Umm... on that UDO... I realised after posting that my formula was a bit off. This does better.
;reduces amplitude of an audio signal based on the number of currently active instruments.
;reduction is 3db every doubling of current instances.
;ktime smooths the changes to avoid clicks (defaults to 0.08 seconds)
;iinsnum is the instrument number to monitor (defaults to calling instrument p1. 0 monitors all instruments.)
opcode activedamp, a,aOj
asig, ktime, iinsnum xin
setksmps 1
iinsnum = (iinsnum == -1 ? p1 : iinsnum)
kinsnums active iinsnum, 0, 0
klognum = max(1,kinsnums) * -3
kampfac2 = ampdbfs(log2(max(1,kinsnums)) * -3); drop 3db every doubling.
asig *= lineto(kampfac2, limit:k(ktime, 0.008, 5))
xout asig
endop
Thorin
This is a request for another 'missing' opcode
It would be great to have an opcode in Csound that does what thorin's UDO does. - dealing with amplitudes in a smart, intuitive, adaptive, and 'invisible' way would be great - much used, and useful.
Maybe a new opcode could be added with this or other algorithms or options.
Dr.B.
Dr. Richard Boulanger Professor of Electronic Production and Design I've got a UDO which may help. ;asig activedamp asig
;reduces amplitude of an audio signal based on the number of currently active instruments.
;reduction is 3db every doubling of current instances.
;ktime smooths the changes to avoid clicks (defaults to 0.08 seconds)
;iinsnum is the instrument number to monitor (defaults to calling instrument p1. 0 monitors all instruments.) opcode activedamp, a,aOj
asig, ktime, iinsnum xin
setksmps 1
iinsnum = (iinsnum == -1 ? p1 : iinsnum)
kampfac = ampdbfs(active:k(iinsnum, 0, 1)*-1.5); drop 3db every doubling.
asig *= lineto(kampfac, limit:k(ktime, 0.008, 5))
xout asig
endop
Thorin
I had(/have) this exact same problem. I experimented around a lot,
pretty much blindly since I don't understand what's going on with
Csound nor with the math. Here is my current solution. It is written
in Lua but forgive me as I don't really remember what it does or how
it works. I'm a poor programmer but maybe you can figure it out:
volume = volume * (1 / (math.log(number_of_instruments, 1.61803398875) +1))
The number 1.618... is the golden mean. So I think we're taking 1 over
the log of the number of notes base golden mean.
Hopefully there's something useful for you in that mess. As of now it
is working well in my various test cases.
Dave
On Fri, Dec 4, 2020 at 1:16 PM john <jpff@codemist.co.uk> wrote:
>
> You could use balance of the final ouput, balancing against a reference
> sound to give dynamics
>
> On Fri, 4 Dec 2020, Jason Hallen wrote:
>
> > Hi everyone,
> > I've made a music generator that outputs pieces of music with a user-defined
> > number of instrumental parts. The number of instrumental parts is set at the
> > beginning of the piece and doesn't change throughout the piece, though some
> > instruments may be muted at various points.
> >
> > The amplitude of each instrument note is randomly selected from 0.1 to 0.9 and
> > then divided by the total number of instrumental parts in the piece. I've
> > also calibrated each instrument in the orchestra to stay under 0dbfs when
> > played on its own.
> >
> > That's my crude attempt to scale the amplitudes depending on the number of
> > instrumental parts. However, that doesn't seem like the smartest solution.
> > The more instrumental parts in a piece, the quieter the overall piece gets
> > because the parts are excessively scaled down. There's got to be a better
> > way. Can you recommend better ways to scale instrument amplitude depending on
> > the number of instrumental parts?
> >
> > Thanks!
> > Jason
> > Csound mailing list Csound@listserv.heanet.ie
> > https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> > https://github.com/csound/csound/issues Discussions of bugs and features can
> > be posted here
> >
>
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