[sdiy] string machine technology?

[David Moylan]

The Paia Strings n' Things approach was to use digital gates to provide 
a narrow pulse waveform to approximate the spectral content of a bowed 
string.  Can't remember where I read that description.  I think they may 
have used 12.5% pulses.  Probably more efficient than using an 
individual filter per note as the Omni did.  I think it's just a simple 
RC high pass per note.

Dave


Antti Pitkämäki wrote:
> Hi,
> 
> This is an interesting topic!
> 
> richard at skydancer.com wrote:
> 
>> Aside from the chorus, the only thing that makes a string synth  
>> different to an organ is some high pass filtering and soft attack.
> 
> What about the waveforms? I had an Arp Omni 2 and I remember it had a 
> swith for "hollow waveform on/off", which sounded like that it switched 
> between a sawtooth and a squarewave. Does anybody have experience with 
> any other string machines?
> 
> I know binary dividers create squarewaves, but you can "stack" a few 
> octaves together at certain volumes to get a staired sawtooth waveform.
> 
> Farfisa Compact organs seem to use some sorta hard synced oscillators 
> (there's a word for it... "relaxation oscillator"?? or somehing... 
> "blocking osc"? cant't remember...) as "dividers" to create pulse waves 
> that have a sawtooth shape on the narrower part.
> 
> (neon lamp organs create sawtooths with their "dividers" but that 
> technology isn't used on string machines I guess)
> 
> What ways are there to get sawtooth waveforms on string machines?
> 
> Antti
> 
> _________________________________________________________________
> Express yourself instantly with MSN Messenger! Download today it's FREE! 
> http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>