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You can also bypass such delays using the so-called 'zero latency monitoring' features found on many interfaces, which send the output of the interface A-D converters direct to its D-A converters, so you can monitor without the added latency of the computer buffers. This reduces latency to a couple of milliseconds or less, which (for many people) is close enough to the 'true' zero latency of analogue connections. If you're confused about the causes of latency, and the various solutions that are possible, take a look at our June 2007 feature on the subject :

The good news is that the amount of delay the converters are responsible for is small. Typically, A-D and D-A converters together delay the signal by considerably less than five milliseconds (ms), and it's generally agreed that most people's perceptions are not sharp enough to notice a delay of this order. In fact, this is the reason why latency is not usually thought of as a problem in digital mixers, or stand-alone digital multitrackers. Digital mixers do have latency, but usually, this is only to the extent that their converters have latency, which is small enough to be imperceptible in most circumstances.

Monitoring your inputs in the analogue domain is the only way to hear them with no latency at all, and if you have the right analogue hardware, it's straightforward to do.

A few digital audio interfaces, such as Digidesign's M Box, also contain analogue circuitry allowing you to set up this kind of direct monitoring, but this is unusual.

For this reason, nearly all modern audio interfaces offer a feature that is variously called 'low-latency monitoring', 'near-zero latency', 'direct monitoring' or (wrongly and confusingly) 'zero latency'. Behind the array of different names, the principle is always the same: inputs that you want to monitor can be routed directly to outputs, but this time, the routing happens in the digital domain. In essence, the input signal from your microphone or guitar passes through the A-D converter, and is then split. One copy goes to the computer to be recorded. The other is passed straight to the output of the soundcard, where it's converted back to analogue.

The idea behind Steinberg's ASIO Direct Monitoring protocol (see diagram, left) is to provide a way for the DAW to tell the control panel what to do. The amount of control that ASIO Direct Monitoring gives to the DAW application is limited, but the key feature it enables is allowing the DAW to switch direct monitoring on and off for each input. This means you can turn monitoring off and on for any input without leaving your DAW.

Tu confonds le nombre de pistes présentes dans un projet global de mixage et le nombre de pistes transitant par la carte son.

Tu peux avoir 999 pistes en 192khz et 24 bits passant sans souci par de l'USB 1, si tout simplement ça passe par le bus master : en fait il n'y aura qu'une seule piste stereo.

demander sur un des sites M.A.O ou je suis modérateur