E-MU 0204 USB 2.0 - Manual (Page 17)

Direct Monitoring
0204 USB Owner’s Manual 17
DIRECT MONITORING
Direct monitoring allows you to monitor inputs without having any software
open. It can also be used as an alternative to software monitoring if you desire the
lowest latency monitoring possible.
When using a computer for digital recording, an audible time delay occurs while
the audio signal is being input to the computer, processed by the software and then
returned to the output for monitoring. This time delay is called Latency.
Latency becomes a problem when you have to use high buffer settings to conserve
CPU resources. Because the 0204 USB has hardware direct monitoring, you can
enjoy zero latency regardless of your buffer setting.
NOTE
Direct monitoring on
channels 1/2 only at 176.4
or 192 kHz sample rates.
The Direct Monitor feature connects the input signals to the output when recording
so that you can hear your performance without delay. The Direct Monitor level
control lets you adjust the volume of the input signal in relation to the recorded
tracks.
Direct monitoring is controlled manually from the Direct Monitor switch on the
0204 USB. It’s not necessary to turn it on in your recording application.
Direct Monitoring vs. Software Monitoring
Direct monitoring is lower latency and can also be used without software running.
Software monitoring has the advantage of allowing audio effects or EQ added in
the host software to be heard on the output. Its round-trip latency depends on
what latency is chosen in the ASIO configuration. If you choose to software
monitor, make sure to disable direct monitoring. If both are enabled, you will
experience a ‘comb filter’ or doubling effect.
USB
Software Monitoring
Direct Monitoring
Latency (delay)
Direct Monitoring allows you to listen to the direct sound of your instrument during
recording, without the delay incurred by going to the computer and back.