J'ai trouvé dans l'aide de logic :
[citation]Logic supports the ReWire software interface from software manufacturer Propellerheads. ReWire is an interface between sequencer and audio applications. ReWire works with hardware supported by Logic's native audio engine.
Please start Logic first, and then start your ReWire application(s). Please also refer to any notes regarding this in ReWire's "read me" files. ReWire scans for ReWire-compatible applications or system extensions; Propellerheads' ReBirth, for example.
Logic will display the audio returns of ReWire-connected applications as audio objects: You're able to insert plug-ins and create sends to busses on these returns, as per a normal audio track.
In order to use the audio returns of ReWire-connected applications, select an audio object and choose the desired ReWire audio-return in the flip menu of the Cha parameter of the audio object. In this flip menu you will find ReWire channels listed with their names along with the audio tracks, inputs, busses and outputs. ReWire or the application to which the connection belongs generates the names for these channels. The naming of a ReWire channel is not relevant to Logic.
For example, if a channel is called "Mix" it has no specific function related to that name as far as Logic is concerned. It is up to decide what to do with whatever channel. If there is no audio object for a ReWire return created in the Environment, no audio is transferred between a ReWired application and Logic. How does this work in practice with ReBirth, for example? In this case, you will find two channels called "Mix L" and "Mix R" within Logic. The two Mix channels return the summed mix of ReBirth's outputs. You will also find channels for every individual instrument. When creating an audio object for another channel such as the bass drum, for example, you will only hear the bass drum through that channel, and it is removed from the mix returns.
In comparison to VST2, Rewire has a relatively high MIDI latency due to technical reasons. This is not an issue when using software like Rebirth with Logic, as both applications are audio sequencers that are sample-accurately synced via the audio clock. Logic is always Sync master. As Logic is also the Cycle master, Skip Cycle works, too.
The following functions are shared between the applications:
start/stop,
repositioning,
cycle start & end,
tempo change
Please note: Logic must be in play mode for ReWire live input to work.
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