User`s guide

CHAPTER
89
12 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
828mkII input, passes through the 828mkII
hardware into the computer, through your host
audio software, and then back out to an 828mkII
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 828mkII’s CueMix DSP feature
to patch the input directly to your monitor outs via
the 828mkII audio hardware. This is just like
bussing inputs to outputs in a digital mixer. For
details, see “CueMix DSP hardware monitoring”
on page 93.
If you do need to process a live input with plug-ins,
or if you are playing virtual instruments live
through your 828mkII 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Adjusting the audio I/O buffer . . . . . . . . . . . . . . . . . . . . . . . 90
Adjusting buffer settings under Mac OS X. . . . . . . . . . . . 91
Adjusting the buffer setting under Mac OS 9. . . . . . . . . 92
Lower latency versus higher CPU overhead . . . . . . . . . . 92
Transport responsiveness . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Effects processing and automated mixing . . . . . . . . . . . 93
CueMix DSP hardware monitoring . . . . . . . . . . . . . . . . . . . 93
Two methods for controlling CueMix DSP. . . . . . . . . . . . 93
Using CueMix Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Controlling CueMix DSP from your audio software . . 94
!828 Manual/Mac Page 89 Tuesday, May 27, 2003 1:45 PM