User Manual
User's Guide Fireface UFX II © RME
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9. Operation under ASIO 
9.1 General 
Start the ASIO software and select ASIO MADIface USB as the audio I/O device or the ASIO 
audio driver. 
The Fireface UFX II supports ASIO Direct Monitoring (ADM). 
The Fireface UFX II MIDI I/Os can be used with both MME MIDI and DirectMusic MIDI. 
9.2 Channel Count under ASIO 
At a sample rate of 88.2 or 96 kHz, the ADAT optical input and outputs operate in S/MUX mode, 
so the number of available channels per port is reduced from 8 to 4. At a sample rate of 176.4 
and 192 kHz, the ADAT optical input and output operates in S/MUX4 mode, so the number of 
available channels is limited to 2. 
Note
:  When  changing  the  sample  rate  range  between  Single,  Double  and  Quad  Speed  the 
number of channels presented from the ASIO driver will change too. This may require a reset of 
the I/O list in the audio software. 
Single Speed  Double Speed  Quad Speed 
Fireface Analog 1 to 12  Fireface Analog 1 to 12  Fireface Analog 1 to 12 
Fireface AES L / R  Fireface AES L / R  Fireface AES L / R 
Fireface ADAT 1 to 16  Fireface ADAT 1 to 8  Fireface ADAT 1 to 4 










