Edirol UA-20 Owner's Manual page 59

Recording produces a silent file
Did you specify the correct audio data input source within the operating
system?
Depending on the software you are using, you may need to specify the UA-20 as the
audio data input source for your computer. For details on this setting, refer to "Driver
settings" (p. 26), "Input/output device settings" (p. 34), "OMS settings" (p. 38),
"FreeMIDI settings" (p. 41).
Did you specify the correct audio data input source within your software?
Can't play/record 24-bit audio data
Does your software support 24-bit audio data?
You will need to use software that supports 24-bit audio data.
Is your software set to record/play 24-bit audio data?
Set your software to 24-bit.
Can't record/play MIDI
Have you correctly specified the MIDI device you want to use?
In order to record/play MIDI tracks via the UA-20, you must install the UA-20 driver
correctly (➔ "Driver installation and settings" (Windows, p. 12 / Mac OS, p. 32)).
You must also specify the MIDI device that you want to use with your software. For
details on this setting, refer to "Driver settings" (p. 26), "Input/output device
settings" (p. 34), "OMS settings" (p. 38), "FreeMIDI settings" (p. 41).
Appendices
59