RME Audio HDSPe RayDAT, User Manual

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User's Guide HDSPe RayDAT
© RME
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10.3 Known Problems
If a computer does not provide sufficient CPU-power and/or sufficient PCIe-bus transfer rates,
then drop outs, crackling and noise will appear. We recommend to deactivate all PlugIns to veri-
fy that these are not the reason for such effects.
A typical source of trouble is incorrect synchronization. ASIO does not support asynchronous
operation, which means that the input and output signals not only have to use the same sample
frequency, but also have to be in sync. All devices connected to the HDSPe must be properly
configured for Full Duplex operation. As long as SyncCheck (in the Settings dialog) only displays
Lock instead of Sync , the devices have not been set up properly!
When using more than one HDSPe system, all units have to be in sync. Else a periodicly re-
peated noise will be heard.
RME supports
ASIO Direct Monitoring (ADM). Please note that not all programs support ADM
completely or error-free. The most often reported problem is the wrong behaviour of panorama
in a stereo channel. Also try to avoid setting the TotalMix FX hardware outputs (third row) to
mono mode. This will most likely break ADM compatibility.
In case of a drift between audio and MIDI, or in case of a fixed deviation (MIDI notes placed
close before or behind the correct position), the settings in Cubase/Nuendo have to be changed.
At the time of print the option 'Use System Timestamp' should be activated. The HDSPe system
supports Windows MIDI and DirectMusic MIDI. Which one works better depends on the respec-
tive application.
11. Using more than one HDSPe RayDAT
The current drivers support operation of up to three HDSPe RayDAT. All cards of the HDSP and
HDSPe system use the same driver, therefore can be used at the same time. Please note that
only one TCO of one card can be used. All units have to be in sync, i.e. have to receive valid
sync information either via word clock or by using AutoSync and feeding synchronized signals.

If one of the HDSPe systems is set to clock mode Master, all others have to be set to clock
mode Slave, and have to be synced from the master device, for example by feeding word
clock. The clock modes of all units have to be set up correctly in their Settings dialog.

If all units are fed with a synchronous clock, i.e. all units show Sync in their Settings dialog, all
channels can be used at once. This is especially easy to handle under ASIO, as the ASIO
driver presents all cards as one.
Note: TotalMix resides inside the hardware of the respective card. Up to three mixers are availa-
ble, but these are separated and can't interchange data. Therefore a global mixer for all units is
not possible.