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17.4.3 Loopback Analog Out to USB Record
Loopback is an optional internal routing of the analog outputs 1/2 and 3/4 to USB Record 1/2, 3/4
and 5/6. This can be used to send playback data to DIGICheck Mac, process and re-record audio
and much more. Loopback is the lowest option in the I/O – Settings menu.
What sounds like an easy to use function can cause trouble and has limitations. Note that:
3/4 and 5/6 as target are only available in Basic Mode Multi-channel
Settings not available (no multichannel mode, setting already used from the other output) are
shown in brackets
The signal sent to USB is available Pre FX and Post FX, but Post FX is taken before the
volume control. To prevent overloads at active EQ, Post FX is also available as -6 dB option,
lowering the USB signal by 6 dB, thus giving a bit of headroom.
With active Loopback 1/2 the analog input is no longer available for recording. A message in
both the Analyser screen of the Analog Input and in the Status Overview screen reminds the
user why no record signal is received from the analog inputs.
Loopback includes all FX from the menu Line Output 1/2 and Phones 3/4 Settings: Mono,
Width, M/S-Proc, Phase Invert and Crossfeed, as well as EQ, B/T and Loudness. However,
the latter is still dependent on the output Volume setting and the VOL-Ref, although the level
of the USB recording signal is not changed by VOLUME. This is correct as the current sound
of the analog path is recorded 1:1. But unlike most other settings, Loudness can go unnoticed
in this case and change the recording unintentionally. It is recommended to deactivate Loud-
ness in such cases.
The simplified block diagram illustrates how the analog channels 1/2 and 3/4 are taken after the
DSP FX processing (but before Volume, not shown) and routed to the USB recording channels 1
to 6. The original source (analog and digital inputs) is no longer present on the USB record path.
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User's Guide ADI-2/4 Pro SE - v 1.0
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