B2 Audio Duo User Manual download pdf (Page 20)

Jan 2015 VB-Audio Software

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V.Burel

USER MANUAL VOICEMEETER BANANA 2.0.0.8 revision 2

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VB-AUDIO Voicemeeter Non Contractual document page 20

without notice. (www.vb-audio.com

/ www.voicemeeter.com )

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- SR: is giving the current samplerate of the device (which can be different for each

device, Voicemeeter is based on multi points and multi formats audio engine able to

manage most of audio system configurations).

- buf gives the current buffer size used by the audio device (Voicemeeter Audio engine

support different buffering on all audio points).

- Ch: gives the number of channel managed by the devices (Voicemeeter can manage 1

to 2 channels on inputs and up to 8 channels on outputs).

- r : gives the bit resolution of the device (voicemeeter uses 16bits resolution per default).

- S: means “share mode” (applicable for WDM device only. KS is usually in exclusive

mode and MME in share mode. For WDM it depends on devices and audio engine

mode).

Note: Output A1 device configuration gives the main audio configuration of Voicemeeter

and the configuration of Voicemeeter virtual ASIO driver (Sample rate and buffer size). It

also means that all audio processing done in voicemeeter will be based on this sample

rate (if some audio points work in another sample rate, conversion will be done to this

main sample rate.).

In this dialog box, you can change the latency used by MME, WDM and/or KS audio drivers.

Basically MME driver support buffering between 512 and 2048 samples , while WDM and KS

can go down to 256 samples (that makes audio processing very closed to the real time –

practically usable to sing on a song in real time – karaoke – or to play digital piano on music in

real time).

Some PC configurations (or some audio devices) will work very well with minimal buffering

values while other will not (the sound stream could be not stable and generates too much

sound’s cut). That’s why per default MME device uses 1024 samples buffering while WDM

device is using 512 samples (these default settings should work for 100% PC configuration

cases).

Under Windows XP, WDM driver are not available. (That we call WDM driver is audio device

driver that can be handled by Microsoft WASAPI, for better audio performances and quality).

But some audio device can support KS interface and then provide low latency support.

Preferred Main Sample Rate can be used as a wish to make Voicemeeter run output device A1

in the wanted sample rate (44.1, 48, 88.2, or 96 kHz). But it also depends on the audio device

current configuration (that could stay in its own sample rate anyway).

Engine mode provides a SWIFT mode to possibly improve real time (experimental option).WDM

Input devices are driven in SHARED mode per default to avoid possible WASAPI Exclusive

mode bug (see known issues).

Getting Optimal Latency:

The choice of the Output A1 is critical since it gives the master sample rate and main buffer

size. So we recommend to select your best audio device as output A1 (preferred ASIO if

possible, WDM or KS otherwise) – with ASIO device the buffer size is given by the ASIO driver

itself (that can usually be set by the ASIO Specific Control Panel of your audio board).

To improve latency, you can also decrease the latency buffer size (for example down to 256)

especially with WDM or KS devices. If using WDM devices, you can again reduce global latency

(the time between microphone and speaker ) by using SWIFT mode.

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B2 Audio Duo User Manual Page 20

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