So I'm working on a mean lead, and I want to have a chunky palm-muted
sound when the mod wheel's all the way down. (The mod wheel and pitch
wheel have a bunch of conditional interactions for bend vibrato,
slides, etc.) After looking at a couple traces, and playing some
guitar, I've concluded that the biggest factor in palm muting
*without* distortion is simply a fixed-size ADSR envelope that only
lasts about half a second. However, all of the adsr opcodes appear to
imply the sustain time either from MIDI or from note length in the
score. Do I have to build my own out of linseg/expseg, or did I miss
something?

Another thing I wanted to investigate were squealing pinch harmonics.
I know the theory and technique; I should just have to clip out the
even harmonics. Unfortunately, that doesn't seem like something that
can be done easily. Is there some cute trick I haven't seen for doing
this kind of manipulation? I tried adding up the even partials, but my
basic waveform is too complex to have predictable partials, so the
math is always off. I already tried Google; it seems like any search
for squeals or howls (guitar feedback) ends up at tutorials for the
Tom Sawyer synth sound. (Don't get me wrong. It's a great sound, but
not anywhere near what I want.)

~ C.

pinch harmonics come when you choke up on the pick enough that right 
after the string is released from the hard edge of the pick , the string 
gets dampened by the meat of your thumb. the place where you pick and the 
note being fretted are critical in determining which harmonics survive the 
every brief dampening.

http://en.wikipedia.org/wiki/Pinch_harmonic#Technique
i just uploaded acoustic guitar pinch harmonics to wikimedia so you could 
hear a little better what the dry effect is.

k.

On Sun, 30 Jan 2011, Victor Lazzarini wrote:

> Aren't pinch harmonics played by softly touching the 1/2 pos of a vibrating 
> string? In that case there will be a node there so only modes that are 
> multiples of
> 2 will be sounding, isn't that what he meant?
>
> Victor
> On 30 Jan 2011, at 11:01, Jim Credland wrote:
>
>> I'm curious, why is it the even harmonics?  Surely which harmonics go 
>> missing depends pretty fundamentally on where your fingers are when you 
>> play the harmonic.  If you're fingered near the top of the fretboard you 
>> might only end up with even harmonics.
>
>
>
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> csound"


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I know this mail was from a while back, but I'm curious about the pinch 
harmonics :)

On 02/10/2010 22:43, Corbin Simpson wrote:
> So I'm working on a mean lead, and I want to have a chunky palm-muted
> sound when the mod wheel's all the way down. (The mod wheel and pitch
> wheel have a bunch of conditional interactions for bend vibrato,
> slides, etc.) After looking at a couple traces, and playing some
> guitar, I've concluded that the biggest factor in palm muting
> *without* distortion is simply a fixed-size ADSR envelope that only
> lasts about half a second. However, all of the adsr opcodes appear to
> imply the sustain time either from MIDI or from note length in the
> score. Do I have to build my own out of linseg/expseg, or did I miss
> something?
>
I'd just build something with linseg, it's pretty easy for what you're 
doing here.  If you're triggering from midi you probably want the 
linsegr function though.

I'd have thought you'd probably want to do something with a filter 
envelope too.  I think the top end drops off far more rapidly when 
you're using palm muting.
> Another thing I wanted to investigate were squealing pinch harmonics.
> I know the theory and technique; I should just have to clip out the
> even harmonics. Unfortunately, that doesn't seem like something that
> can be done easily. Is there some cute trick I haven't seen for doing
> this kind of manipulation? I tried adding up the even partials, but my
> basic waveform is too complex to have predictable partials, so the
> math is always off. I already tried Google; it seems like any search
> for squeals or howls (guitar feedback) ends up at tutorials for the
> Tom Sawyer synth sound. (Don't get me wrong. It's a great sound, but
> not anywhere near what I want.)
>

I'm curious, why is it the even harmonics?  Surely which harmonics go 
missing depends pretty fundamentally on where your fingers are when you 
play the harmonic.  If you're fingered near the top of the fretboard you 
might only end up with even harmonics.

What are you using as your osciliator/waveform for the basic sound?  
Perhaps you can get the right kind of effect by just switching to 
something with fewer partials (square perhaps) and jumping up an octave 
or two.  You might need to mix something in to maintain the attack.
cheers, J.


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Aren't pinch harmonics played by softly touching the 1/2 pos of a  
vibrating string? In that case there will be a node there so only  
modes that are multiples of
2 will be sounding, isn't that what he meant?

Victor
On 30 Jan 2011, at 11:01, Jim Credland wrote:

> I'm curious, why is it the even harmonics?  Surely which harmonics  
> go missing depends pretty fundamentally on where your fingers are  
> when you play the harmonic.  If you're fingered near the top of the  
> fretboard you might only end up with even harmonics.



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But if you do it at 1/2 vibrating length, that will keep even modes,  
removing odd modes, will it not? That being the most prominent  
harmonic position, it must
be used quite a lot.

On 26 Jan 2011, at 04:32, kelly hirai wrote:

> pinch harmonics come when you choke up on the pick enough that right  
> after the string is released from the hard edge of the pick , the  
> string gets dampened by the meat of your thumb. the place where you  
> pick and the note being fretted are critical in determining which  
> harmonics survive the every brief dampening.
>
> http://en.wikipedia.org/wiki/Pinch_harmonic#Technique
> i just uploaded acoustic guitar pinch harmonics to wikimedia so you  
> could hear a little better what the dry effect is.
>
> k.
>
> On Sun, 30 Jan 2011, Victor Lazzarini wrote:
>
>> Aren't pinch harmonics played by softly touching the 1/2 pos of a  
>> vibrating string? In that case there will be a node there so only  
>> modes that are multiples of
>> 2 will be sounding, isn't that what he meant?
>>
>> Victor
>> On 30 Jan 2011, at 11:01, Jim Credland wrote:
>>
>>> I'm curious, why is it the even harmonics?  Surely which harmonics  
>>> go missing depends pretty fundamentally on where your fingers are  
>>> when you play the harmonic.  If you're fingered near the top of  
>>> the fretboard you might only end up with even harmonics.
>>
>>
>>
>> Send bugs reports to the Sourceforge bug tracker
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>> "unsubscribe csound"
>
>
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>



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I didn't expect this thread to get revived. Our drummer rage-quit, so
I've retired the electric sounds for the past few months. :3

Yes, typically the divisor used will remove the odd harmonics. (I
guess it depends how you count. If you count fundamental, first,
second... then it will leave first, third... But if you count first,
second, third... then it leaves the even ones.) Subsequent pinch
points leave only every third harmonic, every fourth harmonic, and so
on.

I did find http://www.csounds.com/mikelson/, whose multifx suite is
awesome. I don't understand how they work, exactly, but the distortion
and feedback are fantastic. I started trying to integrate them,  but
lost interest so I never finished the sound. Seeing this thread again
makes me want to go back and finish the job. :3

~ C.

On Sun, Jan 30, 2011 at 7:19 AM, Victor Lazzarini
 wrote:
> But if you do it at 1/2 vibrating length, that will keep even modes,
> removing odd modes, will it not? That being the most prominent harmonic
> position, it must
> be used quite a lot.
>
> On 26 Jan 2011, at 04:32, kelly hirai wrote:
>
>> pinch harmonics come when you choke up on the pick enough that right after
>> the string is released from the hard edge of the pick , the string gets
>> dampened by the meat of your thumb. the place where you pick and the note
>> being fretted are critical in determining which harmonics survive the every
>> brief dampening.
>>
>> http://en.wikipedia.org/wiki/Pinch_harmonic#Technique
>> i just uploaded acoustic guitar pinch harmonics to wikimedia so you could
>> hear a little better what the dry effect is.
>>
>> k.
>>
>> On Sun, 30 Jan 2011, Victor Lazzarini wrote:
>>
>>> Aren't pinch harmonics played by softly touching the 1/2 pos of a
>>> vibrating string? In that case there will be a node there so only modes that
>>> are multiples of
>>> 2 will be sounding, isn't that what he meant?
>>>
>>> Victor
>>> On 30 Jan 2011, at 11:01, Jim Credland wrote:
>>>
>>>> I'm curious, why is it the even harmonics?  Surely which harmonics go
>>>> missing depends pretty fundamentally on where your fingers are when you play
>>>> the harmonic.  If you're fingered near the top of the fretboard you might
>>>> only end up with even harmonics.
>>>
>>>
>>>
>>> Send bugs reports to the Sourceforge bug tracker
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>>> Discussions of bugs and features can be posted here
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>>> csound"
>>
>>
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>>
>
>
>
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>
>



-- 
When the facts change, I change my mind. What do you do, sir? ~ Keynes

Corbin Simpson



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