7
Appendix
7.3
Special Notes
The following sections include remarks on special aspects of clock and samplerate that result
from the specifics of Windows
TM
operating systems. The notes are of a general nature and valid
in principle for other sound systems as well. For more transparency, though, we are referring to
the SERAPH M2.
7.3.1
Clock settings when using ASIO
Working with an audio application using the ASIO interface of the SERAPH M2, all
clock settings will be managed by that program and overwrite the current settings in the
manager!
Which clock source is used, can still be read in the clock settings within the
SERAPH M2 manager. The manual of the application should give report about which clock
source the audio application chooses under which circumstance. If the audio application is closed
(communication with the ASIO driver is terminated), all previous clock settings are being reset.
7.3.2
Samplerate on record/playback
Please note, that a certain samplerate for the SERAPH M2 can only be set, if the clock source
used is the internal clock. If synchronized externally (Clock is being read from MADI 1, MADI
2, Wordclock or SyncBus ), the samplerate will be defined by the connected devices.
Windows
TM
Vista only:
On Windows
TM
Vista a certain samplerate is no longer reported to the sound card, if the audio
application is not using the ASIO interface or WSAPI. The samplerate set up in the advanced
settings of an audio device in the Windows
TM
control panel is used instead. This leads to the
following:
1. If the desired samplerate of an audio application is not equal to the current samplerate, a
samplerate conversion with possibly an audible loss of quality will be the result!
2. When using an audio device of the sound system with the samplerate x and additionally
attempting to use another device but with a samplerate y, an error message will appear,
since the soundcard may only be used with one samplerate at a time. In this case no
resampling (rate conversion) is done!
3. In order to operate several devices with a certain samplerate, this samplerate has to be set
up in the advanced settings of an audio device in the Windows
TM
control panel for each
device separately. As concluded from 2 – no device of the sound system should be in use,
or else a change will be rejected!
7.3.3
Different samplerates on record/playback via ASIO
Example: You already work with certain inputs or outputs of the SERAPH M2 with a certain
samplerate. Now you wish to use other inputs or outputs simultaneously, but with another
samplerate. Since the SERAPH M2 can be operated with one samplerate, only, the driver
will inhibit the usage of the additional inputs or outputs. The simultaneous operation of the
SERAPH M2 with different samplerates is possible using the standard-MME or DirectSound
driver, only.
7.3.4
Simultaneous playback on one device via ASIO
Example: You are playing back on a certain device (e.g. ’SERAPH M2 1-2’) of the SERAPH M2.
Now you wish to playback another signal of another software application via the same device.
The SERAPH M2 driver will inhibit this, except if the simultaneous playback of several audio
programs via the same device happens using the standard-MME or DirectSound drivers.
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