MOTU 896HD User's Guide download pdf (Page 85)

CHAPTER

11 Reducing Monitoring Latency

OVERVIEW

Monitoring latency is that slight delay you hear

when you run an input signal through your host

audio software. For example, you might hear it

when you drive a live mic input signal through a

reverb plug-in running in your audio sequencer.

This delay is caused by the amount of time it takes

for audio to make the entire round trip through

your computer, from when it ﬁrst enters an 896HD

input, passes through the 896HD hardware into the

computer, through your host audio software, and

then back out to an 896HD output.

If you don’t need to process a live input with

plug-ins, the easiest way to avoid monitoring

latency is to use the 896HD’s CueMix DSP feature

to patch the input directly to your monitor outs via

the 896HD audio hardware. This is just like bussing

inputs to outputs in a digital mixer. For details, see

“CueMix DSP hardware monitoring” on page 89.

If you do need to process a live input with plug-ins,

or if you are playing virtual instruments live

through your 896HD audio hardware, you can

signiﬁcantly reduce latency — and even make it

completely inaudible, regardless of what host audio

application software you use. This chapter explains

how.

It is important to note that monitoring delay has no

effect on when audio data is recorded to disk or

played back from disk. Actual recording and

playback is extremely precise.

Monitoring live input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Adjusting the audio I/O buffer . . . . . . . . . . . . . . . . . . . . . . . 87

Adjusting buffer settings under Mac OS X. . . . . . . . . . . . 87

Adjusting the buffer setting under Mac OS 9. . . . . . . . . 88

Lower latency versus higher CPU overhead . . . . . . . . . . 88

Transport responsiveness . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Effects processing and automated mixing . . . . . . . . . . . 89

CueMix DSP hardware monitoring . . . . . . . . . . . . . . . . . . . 89

Two methods for controlling CueMix DSP. . . . . . . . . . . . 89

Using CueMix Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Controlling CueMix DSP from your audio software . . 90

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 104 105

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MOTU 896HD User's Guide Page 85

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