I am helping some friends make their first PD sound installation. They want 25 channels simultaneously running prerecorded samples and have a limited budget and as yet own no equipment. I use the presonus firepod external card in my work which could work with a single cpu chaining 3-4 of firepods together for their project but I doubt their budget can support buying so many of them. For amps we could build 25 simple chip amps with op amp ICs to keep costs down but those that I have built in the past are useful for low volume only. If anyone has other hardware configurations and amplifier schematics that they use I would be grateful for suggestions.
thanks
Greg
You have to be realistic - 25 channels is an extremely hardware
ineffective configuration because audio interfaces come by increments
of 8. Meaning for 25 channels you need 4 of those.
I believe you can do it cheapest if you use OS X: you may borrow from
friends any brand of device and then create in OS X an 'aggregate'
device. This combines any number of any audio interfaces into one big
virtual interface that you then can address with jack. It also solves
the problem of the 25th channel because the aggregate device may
include the machines in-built audio hardware on top of fw/usb things.
Good luck Jurgen
On Oct 25, 2009, at 12:32 AM, Greg Pond wrote:
I am helping some friends make their first PD sound installation. They want 25 channels simultaneously running prerecorded samples and have a limited budget and as yet own no equipment. I use the presonus firepod external card in my work which could work with a single cpu chaining 3-4 of firepods together for their project but I doubt their budget can support buying so many of them. For amps we could build 25 simple chip amps with op amp ICs to keep costs down but those that I have built in the past are useful for low volume only. If anyone has other hardware configurations and amplifier schematics that they use I would be grateful for suggestions.
thanks
Greg
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How important is phase between the channels? If channels drifting out of phase would be a problem, mixing in soundcards that do not share the firewire clock is out of the question. If they do not need to be in phase (ie. the channels are used for isolation rather than mixed for virtual positioning), then there are a larger number of cheaper options to consider. If they need to be in fixed phase than as far as I know firewire cards with a shared clock is your cheapest option aside from soldering soundcards to one another so they share a single clock. Firewire clock chaining is not limited to OSX, it will work under Linux too, and I would be surprised if it did not work under Windows.
jurgen wrote:
You have to be realistic - 25 channels is an extremely hardware ineffective configuration because audio interfaces come by increments of 8. Meaning for 25 channels you need 4 of those. I believe you can do it cheapest if you use OS X: you may borrow from friends any brand of device and then create in OS X an 'aggregate' device. This combines any number of any audio interfaces into one big virtual interface that you then can address with jack. It also solves the problem of the 25th channel because the aggregate device may include the machines in-built audio hardware on top of fw/usb things.
Good luck Jurgen
On Oct 25, 2009, at 12:32 AM, Greg Pond wrote:
I am helping some friends make their first PD sound installation. They want 25 channels simultaneously running prerecorded samples and have a limited budget and as yet own no equipment. I use the presonus firepod external card in my work which could work with a single cpu chaining 3-4 of firepods together for their project but I doubt their budget can support buying so many of them. For amps we could build 25 simple chip amps with op amp ICs to keep costs down but those that I have built in the past are useful for low volume only. If anyone has other hardware configurations and amplifier schematics that they use I would be grateful for suggestions.
thanks
Greg
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Good question here- this work is about creating excessive chatter and doesnt rely on a fixed phase and sync'ed clocks so the inexpensive options you mentioned would be welcome. I should have mentioned this part in my first post.
thanks
Greg
On Sun, Oct 25, 2009 at 3:09 AM, Justin Glenn Smith noisesmith@gmail.com wrote:
How important is phase between the channels? If channels drifting out of phase would be a problem, mixing in soundcards that do not share the firewire clock is out of the question. If they do not need to be in phase (ie. the channels are used for isolation rather than mixed for virtual positioning), then there are a larger number of cheaper options to consider. If they need to be in fixed phase than as far as I know firewire cards with a shared clock is your cheapest option aside from soldering soundcards to one another so they share a single clock. Firewire clock chaining is not limited to OSX, it will work under Linux too, and I would be surprised if it did not work under Windows.
jurgen wrote:
You have to be realistic - 25 channels is an extremely hardware ineffective configuration because audio interfaces come by increments of 8. Meaning for 25 channels you need 4 of those. I believe you can do it cheapest if you use OS X: you may borrow from friends any brand of device and then create in OS X an 'aggregate' device. This combines any number of any audio interfaces into one big virtual interface that you then can address with jack. It also solves the problem of the 25th channel because the aggregate device may include the machines in-built audio hardware on top of fw/usb things.
Good luck Jurgen
On Oct 25, 2009, at 12:32 AM, Greg Pond wrote:
I am helping some friends make their first PD sound installation. They want 25 channels simultaneously running prerecorded samples and have a limited budget and as yet own no equipment. I use the presonus firepod external card in my work which could work with a single cpu chaining 3-4 of firepods together for their project but I doubt their budget can support buying so many of them. For amps we could build 25 simple chip amps with op amp ICs to keep costs down but those that I have built in the past are useful for low volume only. If anyone has other hardware configurations and amplifier schematics that they use I would be grateful for suggestions.
thanks
Greg
Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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Good question here- this work is about creating excessive chatter and doesnt rely on a fixed phase and sync'ed clocks so the inexpensive options you mentioned would be welcome. I should have mentioned this part in my first post.
if it's that simple, how about burning the result as tracks, and play them
from 13 uncoordinated cds with unlimited repeat? at least it's the idea I
got from your very short description.
I agree with you that 25 is extremely hardware ineffective. I have created an aggregate device in OS X before but only with two of the same type of external device but this also seems the best option for a single cpu.
thanks for the input
Greg
On Sun, Oct 25, 2009 at 2:50 AM, jurgen noise.now@gmail.com wrote:
You have to be realistic - 25 channels is an extremely hardware ineffective configuration because audio interfaces come by increments of 8. Meaning for 25 channels you need 4 of those. I believe you can do it cheapest if you use OS X: you may borrow from friends any brand of device and then create in OS X an 'aggregate' device. This combines any number of any audio interfaces into one big virtual interface that you then can address with jack. It also solves the problem of the 25th channel because the aggregate device may include the machines in-built audio hardware on top of fw/usb things.
Good luck Jurgen
On Oct 25, 2009, at 12:32 AM, Greg Pond wrote:
I am helping some friends make their first PD sound installation. They want 25 channels simultaneously running prerecorded samples and have a limited budget and as yet own no equipment. I use the presonus firepod external card in my work which could work with a single cpu chaining 3-4 of firepods together for their project but I doubt their budget can support buying so many of them. For amps we could build 25 simple chip amps with op amp ICs to keep costs down but those that I have built in the past are useful for low volume only. If anyone has other hardware configurations and amplifier schematics that they use I would be grateful for suggestions.
thanks
Greg
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Just a word about devices - I regularly use 3 different interfaces
(Metric Halo, Rosetta 800, Fireface 800) for large recordings and
NEVER have issues. but the devices can't be the cheapest because you
still have to lock the word clock. When you mentioned 'cheap' my first
reflex was on borrowed or rented stuff (I borrow, no money here either).
And you need only 3 plus in-built stereo for channels 25+26...
Good luck Jurgen
On Oct 25, 2009, at 9:08 PM, Greg Pond wrote:
I agree with you that 25 is extremely hardware ineffective. I have created an aggregate device in OS X before but only with two of the same type of external device but this also seems the best option for a single cpu.
thanks for the input
Greg
On Sun, Oct 25, 2009 at 2:50 AM, jurgen noise.now@gmail.com wrote:
You have to be realistic - 25 channels is an extremely hardware
ineffective configuration because audio interfaces come by increments of 8.
Meaning for 25 channels you need 4 of those. I believe you can do it cheapest if you use OS X: you may borrow from friends any brand of device and then create in OS X an 'aggregate'
device. This combines any number of any audio interfaces into one big virtual interface that you then can address with jack. It also solves the
problem of the 25th channel because the aggregate device may include the
machines in-built audio hardware on top of fw/usb things.Good luck Jurgen
On Oct 25, 2009, at 12:32 AM, Greg Pond wrote:
I am helping some friends make their first PD sound installation.
They want 25 channels simultaneously running prerecorded samples and
have a limited budget and as yet own no equipment. I use the presonus
firepod external card in my work which could work with a single cpu chaining 3-4 of firepods together for their project but I doubt their budget can support buying so many of them. For amps we could build 25
simple chip amps with op amp ICs to keep costs down but those that I have built in the past are useful for low volume only. If anyone has
other hardware configurations and amplifier schematics that they use I
would be grateful for suggestions.thanks
Greg
Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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Greg Pond -
João Pais -
jurgen -
Justin Glenn Smith