With Loopback, you gain incredible power and control over how audio is routed around your Mac and between applications. We can't wait to hear about the incredible new uses you find for it! Loopback 2.0.0 A Massive Interface Overhaul The most noticeable change in Loopback 2 is its brand-new user interface. The first version of Loopback offered.
- Loopback 2 0 0 – Route Audio Between Applications Download Free
- Loopback 2 0 0 – Route Audio Between Applications Downloads
- LoopBack middleware are declaratively loaded using the middleware.json file, or imperatively using the app.middleware method. Express middleware can be loaded in the server.js file using app.use or a route definition. LoopBack components can load middleware using the reference to the LoopBack application instance.
- I found the bug of PlayPcmWinAlbum to cause the program crash and it is fixed on version 5.0.75 (or later versions). BTW, PlayPcmWin installer installs two music player programs: one is PlayPcmWin simple music player app which is considered as stable, and another is PlayPcmWinAlbum relatively new 'album player' style music player app.
Overview
LoopBack is built on Express and implements Express’ routing system. However, basic Express routing is limited only to a small portion of the functionality of LoopBack.A large part of LoopBack’s features are implemented using its more detailed extension to the routing system.Understanding this system will help you understand LoopBack better and develop better LoopBack apps.
Summary of Express routing
For those not familiar with routing in Express, here are some key points:
- Routing refers to the rules for capturing requests to the server, and the subsequent passing through and handling of requests through a chain of middleware functions.
- A middleware function accepts three objects, the request object (
req
),the response object (res
),and the next middleware in the chain (next
); in that order. - You load middleware either using
app.use()
or by assigning it as the callback function of aroute definition. - Multiple middleware can be matched to handle the requests to a route,these matched middleware make up the middleware chain for the request.The request will pass through each middleware in the order they were loaded, unless one of the middleware in the chain terminates the propagation.
- Any middleware in the chain may terminate the request propagation by sending a response back to the client.
- A middleware can send the response to the request using one of the response methods in the response objector pass on the request to the next middleware by calling
next()
. - If a middleware sends the server response, conventionally the request does not propagate further in the middleware chain.Any call to
next()
will likely result in an error. - A middleware function can also take four arguments. In this case, it is an error handling middleware.The parameters to the function in their order are: the error object (
err
),the request object (req
), the response object (res
),and the next middleware in the chain (next
).
For more details about routing in Express, see http://expressjs.com/guide/routing.html.
LoopBack routing
LoopBack implements the middleware pattern of request routing, therefore the concept of middleware and routing is the same as in Express.However, the Express aspect of routing is contained within the modified middleware chain generated by LoopBack.The extended routing details in LoopBack is best understood by understanding the LoopBack middleware chain.
LoopBack middleware chain
Finale 25 5 0 259. The LoopBack middleware chain is composed of middleware added to the chain in the following order, and the request passes through them in the given order.
Note:
Except 14, 15, and 16, the listed items refer to LoopBack middleware phases.
- initial:before
- initial
- initial:after
- session:before
- session
- session:after
- auth:before
- auth
- auth:after
- parse:before
- parse
- parse:after
- routes:before
- routes
- routes:after
- files:before
- files
- files:after
- final:before
- final
- final:after
A middleware loaded earlier in the chain gets the prior opportunity to handle the request.If it happens to send a response or fail to call
next()
, the request will terminate at it, and not propagate any further.As evident from the list above, LoopBack takes control of the loading order of the middleware in the app, and prioritizes its relevantmiddleware over those loaded using Express’ interface
app.use()
, components, or boot scripts.Note:
If you add middleware on the
route
or route:after
phase, it will not execute after the route is matched.Instead, it will be ignored because the route was already matched.The middleware to be loaded during the middleware phases are configured in the middleware.json file of the app.The order of the phases in the file are semantic, and cannot be listed randomly.
LoopBack also supports custom phases.Custom phases can be defined in any position of the middleware chain, and may be used to prioritize over LoopBack’s built-in middleware phases.
Loading middleware
LoopBack middleware are declaratively loaded using the middleware.json file,or imperatively using the app.middleware() method.
Express middleware can be loaded in the
server.js
file using app.use()
or a route definition.LoopBack components can load middleware using the reference to the LoopBack application instance.
Boot scripts can load middleware using the reference to the LoopBack application instance.
The Hardware
The USB 3.0 connector on the rear panel carries digital signal to and from your computer in addition to providing power to the UAC-2—no batteries or external power required. Dual front panel combo XLR/TRS inputs allow you to connect a wide variety of microphones as well as line-level signals from electronic keyboards and music players—even passive instruments such as electric guitars and basses. Dual-balanced TRS output jacks enable you to connect the UAC-2 to amplifiers or self-powered speakers, and there's an independent ¼' stereo headphone jack with dedicated volume control for private monitoring of the input or output signal.
Dedicated input gain controls and Clip LEDs make it easy to set optimum input levels, and a large Output knob enables fast control over overall output level. A phantom power switch applies +48 volts to the mic inputs, allowing you to use the UAC-2 with studio-quality condenser microphones, and a three-way Direct Monitoring switch enables monitoring of input signal with zero latency in both mono and stereo. MIDI In and Out connectors allow interfacing with devices such as electronic keyboards and drum machines. Last but not least, a Class Compliant Mode switch enables the UAC-2 to be connected to an iPad.*
* Optional power adapter and Apple Camera Connection kit or Lightning to USB Camera Adapter required
Upsampling
Loopback 2 0 0 – Route Audio Between Applications Download Free
Loopback 2 0 0 – Route Audio Between Applications Downloads
The UAC-2 uses high-end components such as the Burr Brown PCM4202 analog-to-digital converter and AKM AK4396 digital-to-analog converter. In addition, the UAC-2 performs 4-times upsampling during both analog-to-digital (A/D) and digital-to-analog (D/A) conversion. In other words, when the sampling frequency is set to 44.1 kHz or 48 kHz, the UAC-2 processes the signal at high resolution 176.4 kHz or 192 kHz. For A/D conversion, this means less aliasing noise; for D/A conversion, this means increased clarity and fidelity.