Windows Mme Playback - RME Audio Project Hammerfall DIGI9652 User Manual

8.3 Windows MME Playback

The Hammerfall can play back audio data only in supported formats (sample rate, bit
resolution). Otherwise an error message appears (for example at 22 kHz and 8 bit).
In the audio application being used, DIGI9652 must be selected as output device. This can
often be found in the Options, Preferences or Settings menus under Playback Device, Audio
Devices, Audio etc. We recommend using 24-bit resolution for playback, to make full use of the
DIGI9652's potential.
We strongly recommend switching all system sounds off (via >Control Panel /Sounds<). Also
Hammerfall 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 buying a cheap Blaster clone and select this as Preferred Device in >Control
Panel /Multimedia /Audio<.
The RME Driver CD includes step by step instructions for configuring many popular audio
applications, found in the directory \rmeaudio.web\english\techinfo\conf.
The screenshot to the
right shows a typical
configuration dialogue
as displayed by a
(stereo) wave editor.
After selecting a
device, audio data is
sent either to S/PDIF
or to the ADAT ports,
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'. Even at higher buffer settings in a mixed Audio/MIDI
environment, sync problems will not arise because the DIGI9652 always reports the
current play position correctly (even while recording - essential for chase lock synchronization).
The DIGI9652 ADAT optical interface allows sample rates of up to 96 kHz using a
standard ADAT recorder. Single-channel data at this frequency requires two ADAT channels,
achieved using the 'Sample Split' technique. This reduces the number of available ADAT
channels from 24 to 12. Under Windows MME, channels are routed to ADAT devices in double-
speed mode as follows:
Only stereo pairs (1+2) and (3+4) of each ADAT port are available
Channel 1 is routed to channels 1 and 2, channel 2 is routed to 3 and 4 etc.
Please refer to the diagram 'ADAT Track Routing, MME 96 kHz', section 21. Routing for record
and playback is identical.
User's Guide DIGI9652 © RME
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