RME Audio Babyface User manual

User's Guide
Babyface
Portable USB Audio at its best!
USB 2.0 Digital I/O System
22 Channels Analog / ADAT / SPDIF Interface
24 Bit / 192 kHz Digital Audio
20 x 12 Matrix Router
MIDI I/O
MIDI Remote Control
Stand-Alone Operation
Class Compliant Operation
TotalMix™
24 Bit / 192 kHz 9
SteadyClock™SyncCheck™

2 User's Guide Babyface © RME
General
1 Introduction ...............................................................6
2 Package Contents.....................................................6
3 System Requirements ..............................................6
4 Brief Description and Characteristics.....................6
5 First Usage - Quick Start
5.1 Connectors – Controls – Display ............................7
5.2 Quick Start ..............................................................9
Installation and Operation - Windows
6 Hardware Installation..............................................12
7 Driver and Firmware
7.1 Driver Installation .....................................................12
7.2 Driver Update...........................................................13
7.3 De-installing the Drivers...........................................13
7.4 Firmware Update .....................................................13
8 Configuring the Babyface
8.1 Settings Dialog – General ........................................14
8.2 Settings Dialog – Pitch .............................................16
9 Operation and Usage
9.1 Playback...................................................................17
9.2 DVD Playback (AC-3 / DTS) ....................................18
9.3 Notes on WDM.........................................................19
9.4 Channel Count under WDM.....................................20
9.5 Multi-client Operation ...............................................20
9.6 Analog Recording.....................................................21
9.7 Digital Recording......................................................21
9.8 Digital Connections ..................................................22
9.9 Clock Modes - Synchronization ...............................23
10 Operation under ASIO
10.1 General ................................................................24
10.2 Channel Count under ASIO .................................24
10.3 Known Problems ..................................................25
11 Using more than one Babyface .............................25
12 DIGICheck Windows...............................................26
13 Hotline – Troubleshooting......................................27
Installation and Operation - Mac OS X
14 Hardware Installation..............................................30
15 Driver and Firmware
15.1 Driver Installation .................................................30
15.2 Driver Update .......................................................30
15.3 Firmware Update..................................................31
16 Configuring the Babyface
16.1 Settings Dialog – General ....................................31
16.2 Clock Modes - Synchronization ...........................33

User's Guide Babyface © RME 3
17 Mac OS X FAQ
17.1 Round about Driver Installation ........................... 34
17.2 MIDI doesn't work ................................................ 34
17.3 Repairing Disk Permissions................................. 34
17.4 Supported Sample Rates..................................... 34
17.5 Channel Count under Core Audio ....................... 35
17.6 Various Information.............................................. 35
18 Using more than one Babyface............................. 36
19 DIGICheck Mac........................................................ 36
20 Hotline – Troubleshooting ..................................... 37
TotalMix FX
21 TotalMix: Routing and Monitoring
21.1 Overview .............................................................. 40
21.2 The User Interface ............................................... 42
21.3 The Channel ........................................................ 43
Settings.............................................................. 45
Equalizer ........................................................... 46
21.4 Section Control Room.......................................... 48
21.5 The Control Strip.................................................. 49
View Options ..................................................... 50
Channel Layout ............................................. 50
Scroll Location Markers................................. 51
Snapshots - Groups .......................................... 52
21.6 Reverb and Echo ................................................. 53
21.7 Preferences.......................................................... 56
21.8 Settings ................................................................ 57
21.8.1 Mixer Page................................................... 57
21.8.2 MIDI Page .................................................... 58
21.8.3 OSC Page.................................................... 59
21.9 Hotkeys and Usage ............................................. 60
21.10 Menu Options....................................................... 61
22 The Matrix
22.1 Overview .............................................................. 62
22.2 The User Interface ............................................... 62
22.3 Usage................................................................... 62
23 Tips and Tricks
23.1 ASIO Direct Monitoring (Windows)...................... 63
23.2 Copy a Submix..................................................... 63
23.3 Delete a Submix................................................... 63
23.4 Doubling the Output Signal.................................. 63
23.5 Recording a Submix - Loopback ......................... 64
23.6 MS Processing..................................................... 65
24 MIDI Remote Control
24.1 Overview .............................................................. 66
24.2 Mapping ............................................................... 66
24.3 Setup.................................................................... 67
24.4 Operation ............................................................. 67
24.5 MIDI Control......................................................... 68
24.6 Loopback Detection ............................................. 69
24.7 OSC (Open Sound Control)................................. 69

4 User's Guide Babyface © RME
Technical Reference
25 Technical Specifications
25.1 Analog ..................................................................72
25.2 MIDI......................................................................72
25.3 Digital ...................................................................73
25.4 Digital Inputs ........................................................73
25.5 Digital Outputs......................................................73
25.6 General ................................................................73
26 Technical Background
26.1 Lock and SyncCheck ...........................................74
26.2 Latency and Monitoring........................................75
26.3 USB Audio............................................................76
26.4 DS – Double Speed .............................................77
26.5 QS – Quad Speed................................................77
26.6 Noise Level in DS / QS Mode ..............................78
26.7 SteadyClock .........................................................78
27 Diagrams
27.1 Block Diagram Babyface......................................79
27.2 Connector Pinouts................................................80
Stand-Alone and Class Compliant Modus
28 History and General Remarks................................82
29 System Requirements ............................................83
30 Operation .................................................................83
30.1 Useful Hints..........................................................83
30.2 Class Compliant under Windows/Mac OS X .......85
31 Supported Inputs and Outputs..............................86
32 Operation at the Unit...............................................87
33 Application Examples Stand-Alone Mode............88
34 Useful Notes ............................................................89
Miscellaneous
35 Accessories.............................................................92
36 Warranty...................................................................92
37 Appendix..................................................................92
38 Declaration of Conformity......................................94

User's Guide Babyface © RME 5
User's Guide
Babyface
General

6 User's Guide Babyface © RME
1. Introduction
Thank you for choosing the RME Babyface. This unique audio system is capable of transferring
analog and digital audio data directly to Windows and Mac computers. The latest Plug and Play
technology guarantees a simple installation, even for the inexperienced user. Numerous unique
features and well thought-out configuration dialog puts the Babyface at the very top of the range
of computer-based audio interfaces.
The package contains drivers for Windows XP / Vista / 7 /8 and Mac OS X x86 (Intel).
Our high-performance philosophy guarantees maximum system performance by executing as
many functions as possible not in the driver (i.e. the CPU), but within the audio hardware.
2. Package Contents
•Babyface
•Cable USB 2.0 with double power connector
•Breakout cable XLR / TRS / DIN
•D-sub extension cable 1.3m (4.3 ft)
•Carrying bag, grey mesh
•Manual
•RME Driver CD
3. System Requirements
•Windows XP SP2 or up, Intel Mac OS X (10.6 or up)
•1 USB 2.0 port
•Computer with at least Pentium Core 2 Duo CPU
4. Brief Description and Characteristics
•All settings can be changed in real-time
•Buffer sizes/latencies from 48 up to 8192 samples selectable
•4 channels 96 kHz/24 bit Record/Playback via ADAT optical (S/MUX)
•Clock modes slave and master
•Automatic and intelligent master/slave clock control
•Unsurpassed Bitclock PLL (audio synchronization) in ADAT mode
•SteadyClock: Jitter-immune, super-stable digital clock
•DDS technology for free setting of the sample rate
•SyncAlign guarantees sample aligned and never swapping channels
•SyncCheck tests and reports the synchronization status of input signals
•TotalMix for latency-free submixes and perfect ASIO Direct Monitoring
•TotalMix: 264 channel mixer with 46 bit internal resolution
•TotalMix FX: 3-band EQ, Low Cut, Reverb, Echo
•1 x MIDI I/O, 16 channels high-speed MIDI
•2 digitally controlled microphone inputs in reference quality
•2 balanced line outputs, level +15 dBu
•1 x headphone output
•DIGICheck DSP: Level meter in hardware, peak- and RMS calculation

User's Guide Babyface © RME 7
5. First Usage – Quick Start
5.1 Connectors – Controls – Display
The top of the Babyface features a rotary encoder with push switch function, 2 keys, 2 LED
bands and 5 status LEDs.
The two LED bands show the current gain, the input or output level, or indicate the channel to
be set, all dependent on the current mode. The lowest LED signals phantom power (+48 V,
orange), the highest one overload (Clip, red).
The rotary encoder is used to change various parameters directly at the unit. First the left key
Select is used to select the mode which is then displayed by the Status LEDs:
¾Input: Setting the gain of the analog stereo inputs. A
push on the encoder changes between left, right or
both.
¾Output: Setting the output level of the analog outputs
1/2 at the breakout cable. A push on the encoder
activates Dim for the Main Out defined in TotalMix FX
(default: Analog 1/2).
¾Phones: Setting the output levels of the analog
outputs 3/4. A push on the encoder activates Dim for
the Main Out defined in TotalMix FX (default: Analog
1/2).
¾Sync: Synchronisation indicator for the digital optical
input (SPDIF, ADAT). Flashes when the signal has
been detected but is not fully synchronous. See also
chapter 9.9 / 16.2, Clock Modes - Synchronisation.
The key Recall is used to store and load a specific listening volume for the Main Out (default:
Analog 1/2) defined in TotalMix FX. Pushing the knob for 2 seconds stores the current setting. If
the volume (output level) had been changed a quick hit on the Recall key will restore the former
value.
The right side of the Babyface has an instrument input and a
headphones output.
The analog input 2 can be switched in TotalMix between line (low
impedance, balanced, at the breakout cable) and instrument (high
impedance, unbalanced, TRS jack at the unit). See Settings menu
of input channel 2.
The analog outputs Phones (channels 3/4) are available at the breakout cable and on the right
side of the unit. The connectors are not separated electrically. When connecting two head-
phones the volume might be reduced. The low impedance and unbalanced output signal is – in
terms of quality – identical to the ones at the line outputs, but limited to +7 dBu.
In case the phones output is to be used as line output, usually an adapter TRS plug to RCA
phono plugs, or TRS plug to TS plugs is required. More on cable codes and pinouts can be
found in chapter 27.2.

8 User's Guide Babyface © RME
The short circuit protected, low impedance line outputs do not operate servo balanced!
When connecting unbalanced equipment, make sure pin 3 of the XLR output is not con-
nected. A connection to ground will cause a decreased THD (higher distortion) and in-
creased power consumption!
The Babyface has two analog microphone inputs that can operate as line inputs with levels up
to +12 dBu, when set to 0 dB gain. The electronic input stage uses a servo balanced design
which handles unbalanced and balanced signals correctly, automatically adjusting the level
reference.
When using unbalanced cables with the XLR breakout cable: be sure to connect the 'ring'
contact of a stereo TRS jack, and pin 3 of a XLR jack, to ground. Otherwise noise may oc-
cur, caused by the unconnected negative input of the balanced input.
The rear of the Babyface has an
optical input and output, a power
supply connector, a USB socket
and a 15-pin D-sub connector for
the included breakout cable.
OpticalOut USB2.0
Breakout cable Optical In Power
Optical I/O (TOSLINK): The unit automatically detects SPDIF or ADAT input signals. The opti-
cal output can operate as ADAT or SPDIF output, depending on the current setting in the Set-
tings dialog.
USB 2.0: USB socket for connection to the computer.
Socket for power connection. Unburdens the computer’s power supply, or ensures a stable
power supply, in case it proves to be insufficient when taken from the computer. If the power
supply via standard USB cables is not sufficient the included special dual power cable can also
be used.
The included breakout cable provides these connections:
¾Microphone/Line In: 2 x XLR, balanced
¾Line Out: 2 x XLR, balanced
¾Phones Output: 1 x stereo TRS 1/4"
(6.3 mm), unbalanced. Can also be
used as additional line output.
¾MIDI I/O: One MIDI input and output via 5-pin DIN connector.
If the breakout cable turns your desktop into a mess the included extension cable comes to the
rescue. It is simply inserted between the breakout cable and the D-sub connector of the Baby-
face. Then both breakout cable and all cables connected to it will be out of sight, without de-
creasing the Babyface’s technical specifications or performance.

User's Guide Babyface © RME 9
5.2 Quick Start
After the driver installation (chapter 7 / 15), connect the inputs to the analog signal source.
Mount the included breakout cable with or without the extension cable to the D-sub connector of
the Babyface.
The analog input sensitivity can be changed at the unit (Select In) or in TotalMix (Settings,
Gain), assuring the highest signal to noise ratio will be achieved. Also try to achieve an optimum
input level by adjusting the source itself. Raise the source’s output level until the peak level
meters in TotalMix reach about –3 dB.
The analog line inputs of the Babyface can be used with +4 dBu and -10 dBV signals. The elec-
tronic input stage can handle balanced (XLR, TRS jacks) and unbalanced (TS jacks) input sig-
nals correctly.
The Babyface's digital output supports the formats SPDIF and ADAT optical.
On the analog playback side (the DA side), an adjustment of the analog output level can be
done by the rotary encoder (Select Out or Phones), or in TotalMix FX.
The output signal of channels 3/4, Phones, is also available at the unit. The output level can be
set freely using the rotary encoder. This output is a low impedance type, which can also be
used to connect headphones.
TotalMix FX remembers all settings, and loads these automatically when the Babyface drivers
are loaded.

10 User's Guide Babyface © RME

User's Guide Babyface © RME 11
User's Guide
Babyface
Installation and Operation – Windows

12 User's Guide Babyface © RME
6. Hardware Installation
Connect computer and Babyface with the supplied USB cable. Turn on the computer. That‘s it.
Chapter 26.3 explains how to find the ideal USB port.
7. Driver and Firmware
7.1 Driver Installation
After the Babyface has been recognized, (see 6. Hardware Installation) the hardware assistant
finds a Babyface. Insert the RME Driver CD into your CD-ROM drive, and follow further instruc-
tions which appear on your computer screen. The driver files are located in the directory
\Babyface on the RME Driver CD.
Windows now installs the driver of the Babyface and
registers it as a new audio device in the system. After a
reboot, the symbols of TotalMix and Settings dialog will
appear in the task bar.
In case the Hardware Wizard does not show up automatically after connecting the Baby-
face, do not attempt to install the drivers manually! An installation of drivers for non-
recognized hardware can cause a blue screen when booting Windows!
In Windows 7 Microsoft removed the automatic start of the Driver Software Update dialog. The-
refore this dialog has to be started manually after the failed driver installation. Hit the Windows
key, type 'Device Manager', start the Device Manager by selecting it from the list and hit Enter.
The device is shown with a yellow warning symbol. Usually it is already found in the correct
category, Sound, Video and Game Controller (Plug & Play detects a multimedia device). Right
click on the device and select 'Update Driver Software' from the context menu.
The dialog Update Driver Software appears. Now follow the instructions given below.
Possible reasons why a Babyface is not found automatically:
•The USB port is not active in the system (check the Device Manager)
•The USB cable is not, or not correctly inserted into the socket
•The Babyface does not receive any or not enough power. In this case please use the in-
cluded dual cable. Plug both connectors from one end of the cable into the computer. If the
Babyface starts correctly the lowest green LED in the left band will flash, the In LED is con-
stantly lit, the lowest one in the right band too.

User's Guide Babyface © RME 13
7.2 Driver Update
When facing problems with the automatic driver update, the user-driven way of driver installa-
tion will work.
Under >Control Panel /System /Device Manager /Sound, Video and Game Controllers /RME
Babyface/Properties /Driver< you'll find the 'Update Driver' button.
XP: Select 'Install from a list or specific location (advanced)', click 'Next', select 'Don't
search I will choose the driver to install', click 'Next', then 'Have Disk'. Now point to the
driver update's directory.
Vista/7: Select 'Browse my computer for driver software', then 'Let me pick from a list of
device drivers from my computer', then 'Have Disk'. Now point to the driver update's direc-
tory.
This method also allows for the installation of older drivers than the currently installed ones.
7.3 De-installing the Drivers
A de-installation of the driver files is not necessary – and not supported by Windows anyway.
Thanks to full Plug & Play support, the driver files will not be loaded after the hardware has
been removed. If desired these files can then be deleted manually.
Unfortunately Windows Plug & Play methods do not cover the additional autorun entries of To-
talMix, the Settings dialog, and the registration of the ASIO driver. These entries can be re-
moved from the registry by a software de-installation request. This request can be found (like all
de-installation entries) in Control Panel, Add or Remove Programs (Vista/7: Programs and Fea-
tures). Click on the entry 'RME Fireface USB'.
7.4 Firmware Update
The Flash Update Tool updates the firmware of the Babyface to the latest version. It requires an
already installed driver.
Start the program fut_usb.exe. The Flash Update
Tool displays the current revision of the Babyface's
firmware, and whether it needs an update or not. If
so, then simply press the 'Update' button. A
progress bar will indicate when the flash process is
finished (Verify Ok).
After the update the Babyface needs to be reset.
This is done by powering down the Babyface for a
short time.
Attention: the Babyface should not be switched off
for less than 5 seconds, because Windows
completely unloads the driver, which takes some
time to finish.
A reboot of the computer is not necessary.
When the update fails (status: failure), the unit's Safety BIOS will be used from the next boot on,
the unit stays fully functional. The flash process should then be tried again.

14 User's Guide Babyface © RME
8. Configuring the Babyface
8.1 Settings Dialog - General
Configuration of the Babyface is done via its own settings dialog. The panel 'Settings' can be
opened:
•by clicking on the fire symbol in the Task Bar's notification area
The mixer of the Babyface (TotalMix) can be opened:
•by clicking on the double arrow symbol in the Task Bar's notification area
The hardware of the Babyface offers a number of helpful, well thought-out practical functions
and options which affect how the card operates - it can be configured to suit many different
requirements.
The following is available in the Settings dialog:
•Latency
•Operation of the DSP
•Configuration of the digital I/O
•Current sample rate
•Synchronization behaviour
•State of input and output
Any changes made in the
Settings dialog are applied
immediately - confirmation (e.g.
by clicking on OK or exiting the
dialog) is not required.
However, settings should not be
changed during playback or
record if it can be avoided, as
this can cause unwanted noises.
Also, please note that even in
'Stop' mode, several programs
keep the recording and playback
devices open, which means that
any new settings might not be
applied immediately.

User's Guide Babyface © RME 15
Buffer Size
The setting Buffer Size determines the latency between incoming and outgoing ASIO and WDM
data, as well as affecting system stability (see chapter 9.1 / 10).
Errors does not refer to buffer errors, but USB transmission errors. The display will be reset on
any start of a playback/record. More information can be found in chapter 26.3.
Options
DSP – EQ for Record
Switches the 3-band EQ and Low Cut of all input channels into the recording path. In case
Loopback has been activated the EQ and Low Cut of the Output channel is placed into the re-
cording path. See also chapter 23.5.
Optical Out
The optical TOSLINK output can operate as ADAT or SPDIF output. The Channel Status is
fixed to Consumer state.
Note: The optical input detects the incoming format automatically.
SPDIF In
TMS activates the transmission of Channel Status data and Track Marker information from the
SPDIF input signal.
Clock Mode
Sample Rate
Sets the currently used sample rate. Offers a central and comfortable way of configuring the
sample rate of all WDM devices to the same value, as since Vista the audio software is no
longer allowed to set the sample rate. However, an ASIO program can still set the sample rate
by itself.
During record/playback the selection is greyed out, so no change is possible.
Clock Source
The unit can be configured to use its own clock (Internal = Master) or the digital input signal
(Optical = Slave). If the external source isn't available (Input Status No Lock), the unit will
change to the internal clock. The current clock source is displayed as Current.
Pitch
More information on Pitch is available in chapter 8.2.
Input Status
Indicates presence of a valid signal at the optical input (Lock, No Lock) and whether the signal
is synchronous (Sync). The third column shows the sample frequency detected by the hardware
(coarse recognition, 32 kHz, 44.1 kHz, 48 kHz etc.). In Clock Mode the clock reference is
shown. See also chapter 26.1.
The About tab includes information about the current driver version as well as the current firm-
ware version of the Babyface.

16 User's Guide Babyface © RME
8.2 Settings Dialog - Pitch
Usually soundcards and audio interfaces generate their internal clock (master mode) by a
quartz. Therefore the internal clock can be set to 44.1 kHz or 48 kHz, but not to a value in be-
tween. SteadyClock, RME's sensational Low Jitter Clock System, is based on a Direct Digital
Synthesizer (DDS). This superior circuitry can generate nearly any frequency with highest pre-
cision.
DDS has been implemented into the Babyface with regard to the needs of professional video
applications, as well as to maximum flexibility. The section Pitch includes both a list of typical
video frequencies (so called pull up/pull down at 0.1% and 4%) and a fader to freely change the
basic sample rate in steps of 1 Hz (!) over a range of +/- 5%.
The Pitch function requires the Babyface to be in clock mode Master (Internal)! The fre-
quency setting will only be applied to this one specific Babyface!
Changing the sample rate during record/playback often results in a loss of audio, or brings
up warning messages of the audio software. Therefore the desired sample rate should be
set at least coarsely before starting the software.
Coarse
Coarse modification in steps of 50 Hz
is done by clicking with the mouse to
the left and right of the fader knob.
Fine
Fine modification in steps of 1 Hz is
done by using the left/right cursor
keys.
Reset
Ctrl key plus left mouse click.
Application examples
Pitch allows for a simultaneous change of speed and tune during record and playback. From
alignment to other sources up to creative effects – everything is possible.
Pitch enables you to intentionally de-tune the complete DAW. This way, the DAW can match
instruments which have a wrong or unchangeable tuning.
Pitch allows for the change of the sample rate of all WDM devices at the same time. Since Vista
this is no longer possible via the audio program, thus requires a manual reconfiguration of all
WDM devices. Changing the sample rate from the Settings dialog solves this problem. As the
change within the system requires some time, record/playback should not be started immedi-
ately, but only after at least 5 seconds after a change.
Tip: the current CPU load can be used to determine if the audio subsystem has finished the re-
configuration.

User's Guide Babyface © RME 17
9. Operation and Usage
9.1 Playback
In the audio application being used, Babyface must be selected as output device. It can often
be found in the Options, Preferences or Settings menus, as Playback Device, Audio Devices,
Audio etc.
We recommend switching all system sounds off (via >Control Panel /Sound<). Also Babyface
should not be the Preferred Device for playback, as this could cause loss of synchronization
and unwanted noises. If you feel you cannot do without system sounds, you should consider
using the on-board sound device or buying a cheap Blaster clone and select this as Preferred
Device in >Control Panel /Multimedia /Audio< or >Control Panel /Sound /Playback<.
The screenshot shows a typical configuration dialog. After selecting a device, audio data is sent
to an analog or digital port, depending on which has been selected as playback device.
Increasing the number and/or size of audio buffers may prevent the audio signal from breaking
up, but also increases latency i.e. output is delayed. For synchronized playback of audio and
MIDI (or similar), be sure to activate the checkbox ‘Get position from audio driver’.
Note on Windows Vista/7:
Since Vista the audio application can no longer control the sample rate under WDM. Instead the
user has to work himself through numerous settings (up to 32 with a MADI card!), and to set the
sample rate to the same value per stereo device.
Therefore the driver of the Babyface includes a workaround: the sample rate can be set globally
for all WDM devices within the Settings dialog, see chapter 8.1.

18 User's Guide Babyface © RME
9.2 DVD-Playback (AC-3/DTS)
AC-3 / DTS
When using popular DVD software players like WinDVD and PowerDVD, their audio data
stream can be sent to any AC-3/DTS capable receiver using the Babyface's SPDIF output. For
this to work, the WDM SPDIF device of the Babyface has to be selected in >Control Panel/
Sounds and Multimedia/ Audio< or >Control Panel/ Sound/Playback<. Also check 'use preferred
device only'.
The DVD software's audio properties now show the options 'SPDIF Out' or similar. When select-
ing it, the software will transfer the non-decoded digital multichannel data stream to the Baby-
face.
Note: This 'SPDIF' signal sounds like chopped noise at highest level. Try to avoid mixing and
routing the signal to your loudspeakers, as they might get damaged.
Multichannel
PowerDVD and WinDVD can also operate as software decoder, sending a DVD's multichannel
data stream directly to the analog outputs of the Babyface. For this to work select the WDM
playback device ’Loudspeaker’ of the Babyface in
XP: >Control Panel/ Sounds and Multimedia/ Audio<, and check 'Use only default devices'.
Additionally the loudspeaker setup, found under >Volume/ Speaker Settings/ Advanced< has to
be changed from Stereo to 5.1 Surround.
Vista/7: >Control Panel/ Sound/ Playback < as ‘Standard’. Additionally the loudspeaker setup,
found under >Configuration<, has to be changed from Stereo to 5.1 Surround.
PowerDVD's and WinDVD's audio properties now list several multichannel modes. If one of
these is selected, the software sends the decoded analog multichannel data to the Babyface.
TotalMix can then be used to play back via any desired output channels.
The typical channel assignment for surround playback is:
1 - Left
2 - Right
3 - Center
4 - LFE (Low Frequency Effects)
5 - SL (Surround Left)
6 - SR (Surround Right)
Note 1: Selecting the Babyface to be used as system playback device is against our recom-
mendations, as professional interfaces should not be disturbed by system events. Make sure to
re-assign the selection after usage or to disable any system sounds (tab Sounds, scheme 'No
audio').
Note 2: The DVD player will be synced backwards from the Babyface. This means when using
AutoSync and/or word clock, the playback speed and pitch follows the incoming clock signal.

User's Guide Babyface © RME 19
9.3 Notes on WDM
The driver offers one WDM streaming device per stereo pair, like Analog 3+4 (Babyface).
WDM Streaming is Microsoft's current driver and audio system, directly embedded into the op-
erating system. WDM Streaming is hardly usable 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.
Several programs do not offer any direct device selection. Instead they use the playback device
selected in Windows under
XP: <Control Panel/ Sounds and Multimedia/ Audio>
Vista/7: <Control Panel/ Sound/ Playback>
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 to ASIO
(see below).
Because of the driver's multichannel streaming ability, Sonar not only finds the stereo device
mentioned above, but also the 8-channel interleaved devices, and adds the channel number at
the end:
Babyface Analog (1+2) 1/2 is the first stereo device
Babyface Analog (3+4) is the next stereo device
Babyface Analog (1+2) 3/4 are the channels 3/4 of the first 8-channel interleaved device.
It is not recommended to use these special interleaved devices. Also it is not possible to use
one stereo channel twice (the basic and the interleaved device).
Multi-Channel using WDM
The WDM Streaming device Loudspeaker (Analog 1+2) of the RME driver can operate as usual
stereo device, or as up to 8-channel device.
An 8-channel playback using the Windows Media Player requires the speaker setup 7.1 Sur-
round. Configure as follows:
XP: >Control Panel /Sounds and Multimedia /Audio /Volume /Speaker Settings /Advanced <
Vista/7: >Control Panel /Sound /Playback /Loudspeaker /Configure <

20 User's Guide Babyface © RME
9.4 Channel Count under WDM
The Babyface’s ADAT optical interface offers sample rates of up to 192 kHz using a standard
ADAT recorder. For this to work single-channel data is spread to two or four ADAT channels
using the Sample Multiplexing technique. This reduces the number of available ADAT channels
from 8 to 4 or 2 per ADAT port.
Whenever the Babyface changes into Double Speed (88.2/96 kHz) or Quad Speed mode
(176.4/192 kHz) all devices no longer available vanish automatically.
WDM Stereo device Double Speed Quad Speed
Babyface Analog (1+2) Babyface Analog (1+2) Babyface Analog (1+2)
Babyface Analog (3+4) Babyface Analog (3+4) Babyface Analog (3+4)
Babyface AS (1+2) Babyface AS (1+2) Babyface AS (1+2)
Babyface ADAT (3+4) Babyface ADAT (3+4) Babyface ADAT (3+4)
Babyface ADAT (5+6) Babyface ADAT (5+6) Babyface ADAT (5+6)
Babyface ADAT (7+8) Babyface ADAT (7+8) Babyface ADAT (7+8)
Note: Under Vista/7 the analog outputs 1/2 show up as Loudspeaker.
9.5 Multi-client Operation
RME audio interfaces support multi-client operation. Several programs can be used at the same
time. Since driver version 0.981 the formats ASIO and WDM can even be used on the same
playback channels simultaneously. As WDM uses a real-time sample rate conversion (ASIO
does not), all active ASIO software has to use the same sample rate.
However, a better overview is maintained by using the channels exclusively. This is no limitation
at all, because TotalMix allows for any output routing, and therefore a playback of multiple soft-
ware on the same hardware outputs.
Inputs can be used from an unlimited number of WDM and ASIO software at the same time, as
the driver simply sends the data to all applications simultaneously.
RME's sophisticated tool DIGICheck is an exception to this rule. It operates like an ASIO host,
using a special technique to access playback channels directly. Therefore DIGICheck is able to
analyse and display playback data from any software, no matter which format it uses.