its a instrument with a 3d bridge on the middle, dividing the string into 2 half-strings, the idea is to play basically with harmonics.. You play on the side opposed to the pickup on a lap steel or slide fashion, 
There is a project on a very good book: Musical Instruments Design by Bart Hopkin
other info
http://en.wikipedia.org/wiki/3rd_bridge
best
Robert


El 21/03/2010, a las 21:26, Pierre Massat escribió:

Well, then i just wouldn't worry about a pre-amp.
What is a 3 bridges guitar by the way?

Pierre

2010/3/21 Roberto Duarte <roberto.duarte@gmail.com>
Thanks Pierre,
what i want to do is to get some noises through these coil mics and amplify some objects with piezo mics, no recording here, I mean will be also real time processing, just for jamming and get used to Pd. 
Eventually I will want to plug in a lap steel guitar or a 3 bridges guitar, it depend on if I can, finally manage to build one...
Could be nice a warm tube preamp sound, but for this, is not really needed. 

Best

Roberto



El 21/03/2010, a las 13:29, Pierre Massat escribió:

Hi Roberto,

I don't know much about what you're asking, but i do know that building audio hardware isn't easy at all, and probably eventually just as expensive as industrial products.
Now concerning the question of whether you should amplify the signal within Pd or not, i'd say it all depends on your needs. If you want to record a singer or an instrument it's always good to have an analog pre-amp before you feed the signal into Pd. If you need it for something else it may not be necessary.
I personnaly use Pd to process the sound of my electric guitar in real-time. For this i use a usb interface (EMU 0404), and the Pd-processed sound ends up in my tube amp.
Anyway, it is very much a matter of taste here, i mean if you like the sound of your mics without a pre-amp it's fine. Amplifying the sound in Pd will not change the sound, whereas amplifying it first with a pre-amp will change it (depending on whether it has tubes, and on the general quality of the product). You just have to choose what you like most.

Pierre

2010/3/21 Roberto Duarte <roberto.duarte@gmail.com>
Hello all,
maybe somebody could bring me some lights about this:

I want to jam with some piezos and coil mics, I could get a cheap M-Audio Quattro or similar (no pre amp included) and all this into Pd for some processing.

What would be better:
1. to get or build some hardware preamps or 
2. to amplify  the signal inside Pd?

Another way to go could be, instead of buying a dedicated Audio Interface, build one on an Arduino board or on this new CUI32 USB board, using those (several) analog inputs. For me, in a way could be good also, because of learning how to do it.

I will appreciate any help or tip on this..

Roberto


Roberto Duarte
+49 30 639 16015
+49 176 967 64274
Treptowerstr. 21, HH 4 Stock
12059 Berlin







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Roberto Duarte
+49 30 639 16015
+49 176 967 64274
Treptowerstr. 21, HH 4 Stock
12059 Berlin








Roberto Duarte
+49 30 639 16015
+49 176 967 64274
Treptowerstr. 21, HH 4 Stock
12059 Berlin
www.robertoduarte.de