Appendix B – Control Protocol

Purpose

Provide simple, effective integration between the US-224 and host software applications.

Introduction

The US-224 provides digital audio I/O, MIDI, and control surface functions in a single affordable USB-based product. While the audio and MIDI I/O follow established which are easily interfaced with host applications, full integration of the control surface aspects of the US-224 requires a set of messages to be defined which permits two-way communication of control information between the host application and US-224.

Functional Groups

The US-224's control surface are divided into several major functional groups:

Transport and Locate switches and status LED's

Per-channel controls (faders, switches, and LED's)

Bank switching buttons and LED's

Function switches, LED's and continuous "data wheel"

Communication model

Standard MIDI controller and sysex messages will be used to communicate between the host and US-224. In many cases, the commands transmitted by the US-224 are identical to those generated by the JL Cooper CS-10 controller. In general, it is desired that overall system "state information" be maintained by the host application, rather than in the US-224. As an example, here is how a change in transport state from STOP to PLAY might be communicated:

User presses PLAY button on US-224.

Play-button command is sent via USB to host application as MIDI .

Application receives Play message from the "US-224 Control" Midi input device.

Application switches to PLAY mode, just as if user had performed the operation with a mouse-click.

Application sends Transport Update message to "US-224 Control" Midi output device, which is sent via USB to the US-224.

US-224 interprets transport-update command, and responds by activating the PLAY LED.

In this example, the US-224 doesn't "know" the state of the transport. It has simply sent command indicating the button-press, and responded to the transport-update command from the host by lighting the appropriate transport LED.

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Tascam US-224 owner manual Appendix B Control Protocol, Purpose, Introduction, Functional Groups, Communication model
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US-224 specifications

The Tascam US-224 is a compact and versatile audio interface designed to meet the needs of musicians, podcasters, and home recording enthusiasts. Launched as part of Tascam's innovative range of products, the US-224 is recognized for its ease of use, portability, and impressive sound quality, making it an ideal choice for those looking to record in various environments.

One of the standout features of the US-224 is its capability to connect directly to a computer via USB, allowing users to harness the power of digital audio workstations (DAWs). This seamless connectivity ensures low-latency performance, enabling users to record and monitor audio in real-time without distracting delays. The interface is compatible with both Mac and Windows operating systems, which broadens its appeal to a wide user base.

The US-224 is equipped with two high-quality microphone preamps, providing sufficient headroom for capturing a wide range of audio sources. These preamps are known for their clear, detailed sound reproduction, making them suitable for various applications, from vocal recordings to instrument captures. Additionally, the interface features phantom power for condenser microphones, ensuring flexibility in microphone choice.

Users will appreciate the integrated mixer on the US-224, which allows for easy control of audio levels and monitoring. The interface includes insert points and line inputs, offering further options for routing signals, whether for instruments or external processing equipment. The built-in MIDI input and output ports also enhance the interface’s versatility, allowing users to connect MIDI controllers and other devices for comprehensive music production.

The compact design of the US-224 makes it highly portable, a significant advantage for mobile recording setups. This lightweight interface can easily fit into a laptop bag, enabling users to capture high-quality audio anywhere. Furthermore, the durable construction of the unit ensures it can withstand the rigors of travel.

In summary, the Tascam US-224 stands out as a reliable audio interface packed with essential features for recording enthusiasts. Its excellent sound quality, robust connectivity options, and user-friendly interface make it a valuable tool for anyone looking to create professional-level recordings effortlessly. Whether in a studio or on the go, the Tascam US-224 provides an unyielding performance that meets the demands of modern audio production.
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