Recording A Submix - Loopback - RME Audio Fireface UFX User Manual

29.5 Recording a Submix - Loopback

TotalMix includes an internal loopback function, from the Hardware Outputs to the recording
software. Instead of the signal at the hardware input, the signal at the hardware output is sent to
the record software. This way, submixes can be recorded without an external loopback cable.
Also the playback from a software can be recorded by another software.
The function is activated by the Loopback button in the Settings panel of the Hardware Out-
puts. In loopback mode, the signal at the hardware input of the corresponding channel is no
longer sent to the recording software, but still passed through to TotalMix. Therefore TotalMix
can be used to route this input signal to any hardware output. Using the subgroup recording, the
input can still be recorded on a different channel.
As each of the 15 stereo hardware outputs can be routed to the record software, and none of
these hardware inputs get lost, TotalMix offers an overall flexibility and performance not rivalled
by any other solution.
The risk of feedbacks, a basic problem of loopback methods, is low, because the feedback can
not happen within the mixer, only when the audio software is switched into monitoring mode.
The block diagram shows how the software's input signal is played back, and fed back from the
Hardware Output to the software input.
The block diagram also shows why with activated Loopback the EQ of the Hardware Output is
now within the record path. With Loopback active the EQ of the input is not in the record path,
only in the monitoring path, even when the Option DSP – EQ+D for Record is activated.
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