Edirol UA-20 Owner's Manual page 18

Driver installation and settings (Windows)
Giving priority to background services
Crackling may occur in the sound if you omit making this
setting. To ensure that audio and MIDI are processed
smoothly, make the setting as follows.
1
Open the System Properties dialog box.
1.
From the Windows start menu, choose Control Panel.
2.
In "Pick a category," click "Performance and
Maintenance".
3.
In "or Pick a Control Panel icon," click the System
icon.
2
Click the Advanced tab.
3
Click [Settings] located at the right of the Performance
area.
The Performance Options dialog box appears.
fig.background
4
Click the Advanced tab.
5
In Processor Scheduling,
choose "Background
services," and click [OK].
6
In the System Properties dialog box, click [OK]. The
System Properties dialog box closes.
Next, you need to make audio device and MIDI device
settings. (➔"Driver settings" (p. 26))
18
Depending on your system,
the System icon may be
displayed directly in the
Control Panel (Classic view).
If so, double-click the System
icon.