Re: [LAU] Connie, an organ template for JACK

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To: <linux-audio-user@...>
Date: Sunday, May 31, 2009 - 5:21 pm

On Sun, May 31, 2009 at 03:29:42PM +0200, Martin Homuth-Rosemann wrote:

> I'm just working on this problem. It clicks because I switch the signals on/off

Looking at the schematics there is no evidence of any
'click removal' action. Also the waveforms summed there
(for 4',8' and 16') would not be sinewaves. Each divider
output has an RC lowpass filter before going to the mix
bus. Assuming the dividers generate square waves, the
smoothest waveform you can get would be a triangular one.
What each of these RC filters does exactly will depend on
the impedance it sees on the mix bus, and this is a complex
function of the drawbar positions (*all* of them for each
bus, since they share the resistors) and the number of
notes already on. If the drawbar for a mix bus is at a
low setting, or at maximum, its impedance would be quite
low (the top end is feeding a virtual ground), in that case
the RC filter frequency moves up, and there is a *highpass*
action from the series capacitor and the mix bus impedance.
This impedance reaches a maximum of around 5k for the third
highest position. If two drawbars are the same position
their corresponding mix busses are even shorted to each
other. So just adding the contributions from each note does
not correspond to what's happening here, both the amplitudes
and the filtering of each note depend on almost the complete
state of the instrument.

Ciao,

--
FA

Io lo dico sempre: l'Italia รจ troppo stretta e lunga.

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Messages in current thread:
[LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sat May 30, 9:30 am)
Re: [LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sat Jul 31, 5:48 pm)
Re: [LAU] Connie, an organ template for JACK, James Morris, (Sat Jul 31, 10:41 pm)
Re: [LAU] Connie, an organ template for JACK, Sampo Savolainen, (Sun Aug 1, 5:27 pm)
Re: [LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sun Aug 1, 6:17 am)
Re: [LAU] Connie, an organ template for JACK, Reuben Martin, (Sun May 31, 5:21 am)
Re: [LAU] Connie, an organ template for JACK, Nick Copeland, (Sun May 31, 11:10 am)
Re: [LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sun May 31, 1:29 pm)
Re: [LAU] Connie, an organ template for JACK, Fons Adriaensen, (Sun May 31, 5:21 pm)
[LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sun Jun 7, 10:30 am)
Re: [LAU] Connie, an organ template for JACK, Emanuel Rumpf, (Sun Jun 7, 12:58 pm)
Re: [LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sun Jun 7, 8:24 pm)
Re: [LAU] Connie, an organ template for JACK, Emanuel Rumpf, (Sun Jun 7, 9:28 pm)
Re: [LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Wed Jun 10, 9:13 pm)
Re: [LAU] Connie, an organ template for JACK, Fons Adriaensen, (Wed Jun 10, 9:45 pm)
[LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sun Jun 14, 9:14 pm)
Re: [LAU] Connie, an organ template for JACK, Fons Adriaensen, (Sun Jun 7, 2:38 pm)
Re: [LAU] Connie, an organ template for JACK, Nick Copeland, (Mon Jun 1, 9:01 am)
[LAU] Connie, an organ template for JACK, Martin Homuth-Rosemann, (Sun May 31, 4:19 pm)
Re: [LAU] Connie, an organ template for JACK, Norval Watson, (Sat May 30, 11:04 am)
Re: [LAU] Connie, an organ template for JACK, Jan Weil, (Sat May 30, 11:12 am)
Re: [LAU] Connie, an organ template for JACK, Norval Watson, (Sat May 30, 12:46 pm)