Edirol UA-4fx USB Audio/MIDI IO device

Advanced Driver toggle switch

In advanced mode (Advanced Driver switch ON), the UA-4FX can record or play sound in native 24 bits, in either 44.100 Hz, 48.000 Hz or 96.000 Hz sample rates. You can choose sample rates using a switch next to the Advanced Driver switch. At 96 Khz, the device is either capture or playback only. MIDI is enabled. Advanced mode support was added in 2.6.28, see below. In normal mode (Advanced Driver switch OFF), the UA-4FX is fully USB sound compliant. It records at the rate of 44.100 Hz, in 16 bits, and is full-duplex. MIDI is disabled.

Sample rates switch

• With Advanced mode OFF, the device will always record/play natively at the rate of 44.1 kHz using 16 bits.
• With Advanced mode ON, the device will be able to record using 24 bits. Choose the sample rate using the SAMPLE RATE switch:
  • 44.1 kHz: play and record at the same time,
  • 48 kHz: play and record at the same time,
  • 96 kHz: play OR record, but not both.

Cold/Hot reboot

• cold reboot: Unplug the USB cord, plug it again. The hotplug mechanism will remove all snd modules and will reload them. Be warned : frequent plug/unplug may harm the device physical contacts.
• shutdown/reboot your computer: it is the recommended way, as it will not harm your device (or the USB cord). Your computer might not turn off the USB power unless you shut down completely. A good place to switch the Advance button is during the grub menu, if you are using grub, and if that fails, shut the computer off completely to switch the Advance button.

See also:

• http://www.rolandus.com/products/productdetails.php?ProductId=758&tab=downloads Drivers. As of 2012/05/01 the Windows 7 drivers appear buggy, but more or less working. Starting and stopping audio causes the computer to freeze for several seconds.+
• http://web.archive.org/web/20091217044117/http://alsa.opensrc.org/index.php/Edirol_UA-4FX Linux driver information and a nice simple overview of the device modes.+

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