12.4 Notes on WDM

The driver offers two devices per stereo pair, like Fireface Analog (1+2) and Fireface Analog (1+2) MME.

Fireface Analog (1+2)

The devices having no MME at the end are WDM Streaming Devices. WDM Streaming is Mi- crosoft's current driver and audio system, directly embedded into the operating system. WDM Streaming is nearly unusable for professional music purposes, as all data is processed by the so called Kernel Mixer, causing a latency of at least 30 ms. Additionally, WDM can perform sample rate conversions unnoticed, cause offsets between record and playback data, block channels unintentionally and much more. Therefore, for general operation, RME recommend not to useWDM devices.

WDM Streaming also replaces the former DirectSound. Synthesizers and Samplers, which achieved latencies below 10 ms using DirectSound, are forced to use WDM in Windows XP. And now operate at high latency. Meanwhile most of these programs support ASIO as low la- tency driver interface.

Several programs do not offer any direct device selection. Instead they use the playback device selected in Windows under <Control Panel/ Sounds and Multimedia/ Audio>. Such software often requires the special functions provided by WDM, and therefore will operate better when using a WDM device. Please note that selecting the Fireface to be used as system playback device is against our recommendations, as professional interfaces should not be disturbed by system events.

The program Sonar from Cakewalk is unique in many ways. Sonar uses the so called WDM Kernel Streaming, bypassing the WDM mixer, thus achieves a similar performance as ASIO and our MME driver (see below). Because of the driver's multichannel streaming ability (option Interleaved, see chapter 12.5), Sonar not only finds the stereo device mentioned above, but also the 8-channel interleaved devices, and adds the channel number at the end:

Fireface Analog (1+2) is the first stereo device Fireface Analog (3+4) is the next stereo device

Fireface Analog (1+2) 3/4 are the channels 3/4 of the first 8-channel interleaved device.

We recommend to not use these special interleaved devices. Also note that it is not possible to use one stereo channel twice (the basic and the interleaved device), even with different applica- tions.

Information on multichannel WDM is found in chapter 12.5.

Fireface Analog (1+2) MME

The devices with the MME suffix bypass the Windows Kernel Mixer. This way, they achieve nearly the same performance as RME's previous (true) MME drivers. Also their behaviour (off- sets, start/stop, multi-client) is identical. So when not using GSIF or ASIO, MME should be your preferred choice.

A small note on ASIO and GSIF: these drivers are completely independent from WDM Stream- ing. They work and perform the same as our previous 'just WDM' drivers.

User's Guide Fireface 800 © RME

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Intel Fireface 800 manual Fireface Analog 1+2 MME
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Fireface 800 specifications

The Intel Fireface 800 is a powerful audio interface celebrated for its high-performance capabilities and versatility in both studio and live settings. Designed to cater to the needs of musicians, producers, and sound engineers, it stands out with its rich feature set and reliable technology.

One of the defining features of the Fireface 800 is its support for an impressive 26 input and 28 output channels. This extensive I/O configuration facilitates seamless integration with a wide variety of audio production setups, allowing users to record multiple instruments simultaneously or create complex routing scenarios. The unit also boasts top-notch analog and digital converters, ensuring pristine sound quality with a dynamic range that captures the nuances of any audio source.

In terms of connectivity, the Fireface 800 is equipped with both FireWire and USB ports, making it compatible with a range of computers and devices. The device utilizes the FireWire 800 protocol, which delivers higher data transfer rates compared to its predecessor. This efficient transfer capability is crucial for maintaining audio fidelity and reducing latency, making it an ideal choice for real-time monitoring and recording.

The Fireface 800 also features standalone operation capabilities, functioning independently of a computer when needed. This is particularly useful for live performances, where reliability and reduced setup complexity are essential. Users can easily connect microphones, instruments, and other equipment directly to the Fireface 800, making it a versatile tool for a variety of scenarios.

With its low-latency driver technology, the Fireface 800 ensures smooth performance even when handling demanding audio tasks. Its advanced ADAT and S/PDIF digital inputs and outputs provide further flexibility for connecting other gear, such as additional preamps and effects processors.

Another noteworthy characteristic of the Fireface 800 is its robust build quality. Designed for regular use in professional environments, the unit features a rugged metal chassis that can withstand the rigors of transport and daily use. This ensures longevity and consistent performance for audio professionals who depend on reliable equipment day in and day out.

In summary, the Intel Fireface 800 is a versatile and powerful audio interface that caters to a wide spectrum of audio production needs. With its extensive I/O capabilities, high-quality converters, reliable connectivity options, and robust design, it continues to be a popular choice among audio professionals striving for excellence in their work.
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