RME Fireface UCX II 40-Channel USB-B Audio/MIDI Interface - Manual (Page 104)

104 User's Guide Fireface UCX II © RME
The block diagram shows the signal flow for various situations, depending on the state of Loop-
back , EQ for Record and Play active . In the diagram Loopback and EQ are switched to off, but a
playback is active in the input.
Some extra notes that are worth to be pointed out again:

The signal recorded by audio software is usually that from the input. But when the option
DSP – EQ for Record has been activated in the Settings dialog the software receives the
Play input signal – as soon as a playback is started from the USB device.

On an output Echo/Reverb gets recorded. To add Echo/Reverb to a playback the playback
must be assigned to an input.

A playback via USB can not be processed and immediately recorded again via DURec. While
the block diagram seems to present such functionality please remember that DURec can do
only one thing at a time
– record or playback.
38.4 Multichannel WAV File Batch Processor
To avoid any kind of performance problems the recording of all channels is done into a single
multi-channel interleaved file, guaranteeing highest streaming performance with any media.
Most digital audio workstations can import such multi-channel wave files directly into their pro-
jects. Also there already exist some free tools to split those multi-channel files into standard
stereo or single channel files. The need for the special RME tool arises from the fact that fully
compatible wave files can not be bigger than 2 GByte. With higher track counts and longer re-
cording times this limit is quickly exceeded. The DURec process of the Fireface UCX II therefore
writes multiple consecutive files of 2 GByte each. Importing these files into typical DAWs re-
quires the user to adjust and align the content of each file to the previous one.
RME’s Multichannel WAV File Batch Processor offers the easiest way to combine and split
those multichannel interleaved files into single or dual channel files. The content of consecutive
files is automatically combined into a single file. In the rare case that these again exceed the 2
GB limit the tool automatically writes RF64 files. The Mac version can also write CAF (Core Au-
dio Format) files.
The RME tool can also perform multiple conversions of different recordings. Once all the single
tasks are set up the software will process them one after the other automatically.