Configuring the HDSPe AoX-D

The HDSPe AoX-D is configured through its dedicated settings dialog.

The panel 'Settings' can be opened by clicking on the hammer symbol in the task bar notification area.

The mixer of the interface, TotalMix FX, can be opened by clicking on the knob symbol in the task bar notification area.

The setting Buffer Size determines the latency between incoming and outgoing ASIO and WDM data, as well as affecting system stability (see chapter 13.1). While ASIO can use any offered buffer size, WDM is limited to 256 (XP) or 512 samples (Win 7/8). The driver handles this automatically, higher settings are only applied to ASIO while WDM will stay at 256/512 internally.

Allows reducing the number of available channels of the driver. This can be useful if the driver is used in a system with limited resources, or if the user wants to reduce the number of channels to simplify the channel selection dialogs.

Allows to freely set which I/Os are available as WDM devices, if these are stereo or multi-channel devices (up to 8 channels), and if one or multiple of the currently active WDM devices should have the Speaker property. More details are found in chapter Configuring the HDSPe AoX-D.

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.

By default, Dante devices in a network are electing a PTP leader automatically. The unit can be configured to announce itself as the preferred leader, which would make the internal clock source the reference clock for the entire network unless there are other devices on the network with the same setting. When elected leader, it is also possible to choose one of the input signals (Dante, MADI, AES, Word Clock) as clock source. If the selected source isn’t available (No Lock), the unit will attempt to lock to another available one (this behavior is called AutoSync). If none is available then the internal clock is used. The current clock source is displayed as Current.

The Word Clock BNC jacks on the optional MADI extension boards act as outputs by default. The checkbox 'input' can be used change the Word Clock BNC of the expansion module in slot A to act as an input instead. The incoming signal can then act as the clock source if 'Sync To External' is active and the HDSPe AoX-D is elected Leader in the Dante network.

Disables TotalMix FX. This is useful if the driver is used in a system where TotalMix FX is not needed.

The source channels of the Phones and AES3 outputs can be set here. They can either be a submix created in TotalMix FX, or one of the additional software playback channels of the driver. If selecting channels for the AES3 input, they replace the currently selected Dante® or MADI input channels.

The routing setup dialog is divided into Input and Output Routing. The input routing is used to replace blocks of 64 network input channels with signals from the MADI extension modules. The output routing is used to copy any block of 64 playback channels from the driver to the MADI extension modules.

Displays the state of the current input signal:

RME’s exclusive SyncCheck technology provides an easy to use indicator of the current clock status. The clock state column indicates whether no signal (No Lock), a valid signal (Lock) or a valid and synchronous signal (Sync) is present at each of the digital clock source inputs.

The WDM (Windows Driver Model) driver provides a method for Windows to access the inputs and outputs of the HDSPe AoX-D. The driver therefore allows sound to be played back from the operating system itself (notification sounds etc.) and from a wide range of multimedia applications. It can be used in addition or as an alternative to the ASIO driver that provides better performance for multichannel applications. WDM supports advanced audio configurations, including complex speaker setups for surround sound and immersive audio playback.

WDM devices typically consist of a few channels, for example to represent a pair of headphones or a set of speakers. The Settings Dialog is used to configure one or more separate WDM devices, which then appear for further configuration in Windows' Sound Settings.

The WDM Devices section of the Settings Dialog has one button to enter the configuration dialog , a status display showing the number of currently enabled WDM devices , and a dropdown field to select between Stereo or Multi-Channel devices.

The number represents both record and playback devices, so '1' means one input and one output device.

Using a multi-channel WDM device allows for the use of multi-channel playback with specialized software as well as Surround sound from DVD or Blu-Ray player software.

Configuring the multi-channel WDM device to a specific surround mode in the Windows Sound control panel requires the device to have the Speaker property. This can be set on the Speaker tab.

This tab includes several options that work on all currently installed cards.

Default: off. Checking this option brings up a dialog to enter a password. Changes in the Settings dialog are no longer written to the registry. As the settings are always loaded from the registry when starting the computer, this method provides an easy way to define an initial state of the HDSPe AoX-D.

Default: off. Checking this option removes short noise bursts when multi-client playback starts but will also introduce some additional CPU load.

Enable MMCSS for ASIO activates support with higher priority for the ASIO driver (Default Off)

This dialog lists all cards currently installed in the system and controlled by the driver. Their order can then be changed by selecting a card and using the up/down arrows. Confirm the operation with the Apply button. This feature comes in handy if different cards are installed and a specific one of them should always be the first in the ASIO channel list.

At the end of each card info line its current firmware version is shown (Revision).

In digital systems, all devices must function as either a Leader (clock source) or Follower (clock receiver). If multiple devices are connected, there must always be one Leader Clock. A digital system can only have one Leader clock at any time.

In Dante networks, connected devices automatically elect a Leader among themselves if the configured sampling rate matches. When the clock mode on HDSPe AoX-D is set to Preferred Leader, all other devices will operate as Followers unless they have been configured to act as Preferred Leader themselves.

In audio network systems, a change of sampling rate is not instantaneous: all devices must be configured to use the new sampling rate explicitly. This is most conveniently done with dedicated network management software, such as Dante Controller.

The SyncCheck technology from RME allows users to easily monitor and verify the current clock status. The Input Status display shows whether there is a valid signal (Lock or No Lock) for each input (Word, MADI, AES, or Sync In). The display also indicates if the signal is valid and synchronized (Sync).

The Clock Source setting allows you to define a preferred input for synchronization. If a valid signal is present on the preferred input, it is used as the sync source. If no valid signal is detected, the system scans the other inputs in sequence. If no inputs have a valid signal, HDSPe AoX-D automatically switches to Leader clock mode.

When using WDM, the card sets the sample rate. If the sample rate of the digital signal and the system do not match, an error may occur. For example, if a 48 kHz signal is detected at the Word Clock input, but the card is set to 44.1 kHz, a red error message will appear, prompting the user to manually set the sample rate to 48 kHz.

When using ASIO, the audio software sets the sample rate, so such mismatches are rare. In follower mode, the external sample rate takes priority, and the system will not allow incompatible settings. For instance, feeding 44.1 kHz prevents the ASIO software from setting 48 kHz unless the clock mode is switched to Leader/Internal.

SyncCheck provides a simple way to verify whether all connected digital devices are properly configured. With SyncCheck, users can easily resolve one of the most common and complex issues in digital studio setups.