Instruction Manual

259
Input Monitoring
Recording
Next, you say "2." In the time it takes you do that, the ADC has converted
the "1" to digital form and the Wave In driver has fed it to SONAR for
processing. SONAR processes the buffer right away and passes the
processed data right back to the Wave Out driver.
Finally, you say "3." By this time the original "1" has been converted back to
analog audio by the DAC, and that analog signal is mixed in with the "3" you
have just said. The ultimate result is that you hear a "1" and "3" mixed
together at the line output of card—seemingly sounding like an echo, but
actually just an artifact of the signal flow through the system.
You can eliminate the echo by muting the line-in from playing back (see To
Eliminate the Echo from Input Monitoring); you’ll send only the processed
signal to the sound card outputs. This technique introduces a little extra
latency to what you hear coming out of your sound card, but if you use
WDM or ASIO drivers with your sound cards, the latency is negligible.
say “2”
say “3”