User's Guide
DIGI96/8 PST © RME
15
9.4 Tab 'Mode'
The Buffer Size value can be set in the RME DIGI Settings dialog, tab 'Mode'. This setting de-
termines the latency (the delay) between the audio application and the DIGI96 series, as well
as general system stability. The higher the value, the more tracks can be recorded and played
back simultaneously, and the longer the system takes to react.
In
RME DIGI Settings
, tab 'Mode', 4 different buffer sizes are available: 256 (6 ms), 512 (11
ms), 1024 (23 ms), 2048 (46 ms). As the real latency depends on the used sample rate, the
values are different for different sample rates:
Choice
Buffer size Resolution 44.1 kHz
48 kHz
88.2 kHz
96 kHz
46 ms/16 bit
2048 s
16 bit
46.4 ms
42.7 ms
23.2 ms
21.3 ms
23 ms/32 bit
1024 s
32 bit
23.2 ms
21.3 ms
11.6 ms
10.7 ms
11 ms/16 bit
512 s
16 bit
11.6 ms
10.7 ms
5.8 ms
5.3 ms
6 ms/32 bit
256 s
32 bit
5.8 ms
5.3 ms
2.9 ms
2.7 ms
The stated latency describes only one way. The complete path through the computer (record
plus playback, monitoring) gives double values.
The setting of the buffer size affects all formats.
MME:
Defines lowest possible latency. The current latency and bit resolution is set in the MME
application.
ASIO:
Sets current latency. Defines the effective interface resolution to 16 or 32 bit.
GSIF:
Sets current latency and locks the current interface resolution to 16 or 32 bit. In Gigastu-
dio's Hardware Settings the same (and only this) resolution will be displayed, either 24 (32) or
16 bit.
9.5 Boot-Option ADAT
The jumper JP4, labelled 'Boot ADAT', configures the card's state between power-on of the
computer and completed boot of the OS. The card is shipped with the jumper set, thus starting
in ADAT mode. This option was introduced because several external devices, especially digital
mixing desks like Yamaha's 01V or Spirit's 328 will produce noise when an SPDIF signal is
present at their ADAT input.
The other way round will normally not cause any problem, as most SPDIF and AES/EBU input
circuits recognize 'wrong' formats, and automatically mute the digital audio signal. To start the
card in SPDIF mode simply pull off jumper JP4.
