Dear list,

I came across the platerev-opcode by chance this weekend and I have to 
say, it was love at first sight. These sounds are so beautiful and 
intriguing!  Still there are several points about some of its parameters 
which I would like to know better to be able to understand what it is 
doing. Maybe someone can help by explaining...

itabexcite: The last two spaces of the table I think do define the 
position of the excitation: radius and phase seem to be other words for 
distance from the centre and angle. Is that right? If not: what is the 
precise meaning of both of the last two parameters?  And what about the 
first parameter? What can be the frequency for that excitation? The 
audio signal doing the actual excitation is obviously totally separate 
of that frequency parameter. Still a change of frequency in that 
parameter is clearly audible...I just can not figure out why...which 
oscillation does this parameter represent?

itabouts: the output-part of those triplets are even more difficult for 
me to imagine. I guess the last two parameters radius and phase could 
denote the position of a virtual microphone on the plate. That would 
make sense to me. But again the first parameter frequency...I have no 
idea...

a1, a2 - aexcite1, aexcite2: It looks like both of the channels  of the 
opcode, if used in two-channel-mode or even multichannel-mode are not 
separate of each other but interact and influence each other. Am I 
right? If so: What a bliss!


Also I would like to mention, that it took years of working with csound 
until I came across that opcode. it might be a bit because it does not 
seem to be listed in one of the opcode categories in the manual where I 
would expect it but one can find it only in the list of opcodes in 
alphabetical order. It is not in...
- Signal generators / Models and emulations
- Signal Modifiers / Reverberation
...and I do not know, what is going on internally, but maybe it is a 
waveguide, so it could/should be listed here...?...
- Signal Modifiers / Waveguides

So my suggestion is also to list the opcode in one of these 
categories...and maybe to add a bit more explanation in the manual.

Maybe someone can answer to all these questions of mine?

Cheers,

Jan Jacob


-- 

sound      |      movement       |       object      |      space
sonic architecture     |      site: http://www.sonicarchitecture.de
spatial electronic composition    |    higher order ambisonic music

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