Edirol UA-4FX
The format of this page is shamelessly copied from the Edirol UA-25 page, because that page is laid out so well.
The Edirol UA-4FX is a good quality audio device, with great features:
- Variety of Input & Output options
- Balanced Input & Output
- Two Professional Grade Mic Preamps
- Built-in Digital Signal Processor with some FX processing capabilities
- Zero-Latency, Direct Monitoring
- USB Bus-Powered
- Phantom microphone power (48 volts)
- Full-duplex audio capture and playback at 48kHz and 24-bit samples
- Half-duplex audio capture and playback at 96kHz and 24-bit samples (switching between capture or playback requires a hot or cold reboot)
- MIDI I/O (support added in linux-2.6.28) Here is the original development work
I hope that this little howto can guide you and save you some time. The logic of the Edirol UA-4FX is that it is operated by hands, directly on the device. There are some hardware limitations, but it is frankly a very nice tool.
The Edirol UA-4FX is partially supported by Alsa: the device is
recognised by the snd_usb_audio module. You can play and record at
44.1kHz and 16-bit samples if you have set the Advanced Driver switch to
off. Full support for 24-bit playback and recording at rates up to
96 kHz has been successfully tested using the patch
below.
Unfortunately, Alsa has little control over this device.
In fact, it is not a problem of operating systems (Linux / FreeBSD / Window), but rather a hardware issue. For example, Input level, Output level, mixing, even sample rate are controlled at the hardware level. There is no software control. Some users may like this old-fashion way of managing a sound card. Others may dislike it. Analyse your needs before purchasing this sound device.
The Edirol UA-4FX is designed to be a simple mixing board. That is why the input and output levels are controlled by knobs and not software.
Fortunately, Alsa offers a variety of features and plugins, which emulate at software level the missing features. This is the advantage of Alsa over other sound systems.
Contents
Understanding the Edirol UA-4FX logic
At first, you should have a look at the back pane. Or look at the photo of the device. Try to locate three important buttons:
Advanced Driver toggle switch
On the left side of the UA-4FX, there is an on/off switch called "Advanced Driver", which controls the USB mode of the device.
- 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
On the left side of the UA-4FX, there is a switch button called "SAMPLE RATE". The switch has four values: 44.1 kHz, 48 kHz, 96 kHz RECORD, and 96 kHz PLAY:
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
Whenever you switch from Advanced ON to Advanced OFF, change sample rates, or change from 96 kHz RECORD to 96 kHz PLAY, you will either need to:
- 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.
Lost?
To understand advance mode, sample rates and REC/PLAY, it is recommended
to use aplay and arecord in verbose (option -v) mode. This is what
we will do during the howto. This will clearly show you how the audio
devices plays and records sound.
Basic Alsa configuration
alsaconf is not required to use the Edirol UA-4FX. Hotplug is able to recognise the audio device. Just plug and play.
Assigning audio system rights
GNU/Linux is a secure system. To play sound, you need audio system rights. To query your systems rights:
$groups
my_username adm disk dialout fax cdrom floppy tape dip video plugdev powerdev scanner
In this example, I don't have enough rights to play/record sound. To assign rights:
Become root (system administrator):
$su
Password:
Enter the administrator password and then:
adduser my_username audio
Will add the user my_username (replace with your username) to the audio group. You should be able to play music.
Naming the Edirol UA-4FX device
If the UA-4FX is the only device of your computer, you can address the
device using the plughw:0,0, but it is not very convenient. We
recommend using the alphanumeric name of the device. To query the name
of your device, type:
$cat /proc/asound/cards
0 [UA4FX ]: USB-Audio - UA-4FX
EDIROL UA-4FX at usb-0000:00:0b.0-6, full speed
1 [Audio ]: USB-Audio - USB Audio
USB Audio at usb-0000:00:0b.1-4.4.3, full speed
Here, you should use plughw:UA4FX rather than plughw:0,0
Testing sound output
Test the card output. This command plays a woman voice on 2 channels ("Front Right", "Front Left"):
speaker-test -c2 -D plughw:UA4FX -twav
Playing sound
You can play any sound and it will be played with a sample rate of 44.1 Khz.
To play a sound:
aplay -D plughw:UA4FX foo.wav
For a better understanding, it is recommended to play in verbose mode:
aplay -v -D plughw:UA4FX foo.wav
Several lines of text will explain what Alsa is doing:
Playing WAVE 'foo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Plug PCM: Hardware PCM card 0 'UA-4FX' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 22050
period_size : 5513
period_time : 125011
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 5513
xfer_align : 5513
start_threshold : 16539
stop_threshold : 22050
silence_threshold : 0
silence_size : 0
boundary : 6206523236469964800
The sound file has a 44.100 Hz sample rate and 16 bits of resolution.
When playing two sounds at the same time, an error message is displayed:
aplay: main:546: audio open error: Device or resource busy
You can play sounds at higher sample rates and 24-bit precision using Advanced mode.
Recording sound
With the UA-4FX device set to Advanced OFF, you can use the arecord
utility from the Alsa package to record any sound from the microphone:
arecord -f cd -t wav -D plughw:UA4FX foobar.wav
For a better understanding, try the same command in verbose mode:
arecord -v -f cd -t wav -D plughw:UA4FX foo.wav
The resulting message:
Recording WAVE 'foo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Plug PCM: Hardware PCM card 1 'UA-4FX' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 22050
period_size : 5513
period_time : 125011
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 5513
xfer_align : 5513
start_threshold : 1
stop_threshold : 22050
silence_threshold : 0
silence_size : 0
boundary : 6206523236469964800
The Edirol UA-4FX is able to record in 24 bits, at the sample rate of 96 Khz.
With Advanced mode enabled, playing a recorded sound at 96 Khz would not work:
aplay -v -D plughw:UA4FX foobar.wav
aplay: main:550: audio open error: No such file or directory
At 96.000 Hz, the audio device can play OR record, but not both.
If aplay complains of "No such file or directory," it might be because the SAMPLE RATE switch is set to 96 kHz RECORD. Try changing it to 96 kHz PLAY. You will then need to cold or hot reboot.
Now you should be able to play the sound:
aplay -v -D plughw:UA4FX foobar.wav
Changing the switch (and enabling Advanced mode) is all that is needed to see something like this:
Playing WAVE 'foobar.wav' : Signed 16 bit Little Endian, Rate 96000 Hz, Stereo
Plug PCM: Linear conversion PCM (S24_3LE)
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 96000
exact rate : 96000 (96000/1)
msbits : 16
buffer_size : 48000
period_size : 12000
period_time : 125000
tick_time : 1000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 12000
xfer_align : 12000
start_threshold : 48000
stop_threshold : 48000
silence_threshold : 0
silence_size : 0
boundary : 6755399441055744000
Slave: Hardware PCM card 0 'UA-4FX' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S24_3LE
subformat : STD
channels : 2
rate : 96000
exact rate : 96000 (96000/1)
msbits : 24
buffer_size : 48000
period_size : 12000
period_time : 125000
tick_time : 1000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 12000
xfer_align : 12000
start_threshold : 48000
stop_threshold : 48000
silence_threshold : 0
silence_size : 0
boundary : 6755399441055744000
Remember, at 96.000 Khz, you can either play OR record, but not both.
Advanced Alsa configuration
The recommended settings in this HOWTO are now:
- Advance mode : OFF
This will record/play sound in 16 bits, at the frequency of 44.100 Hz.
Full-duplex mode
The Edirol UA-4FX is a full-duplex device up to 48.000 Hz. With Advanced mode enabled, you can also set the UA-4FX to 96 kHz PLAY or 96 kHz RECORD. The Edirol_UA-25 page suggests using the asym plugin to get full-duplex 96 kHz operation, but the UA-4FX hardware does not support it.
Custom softvol PCM
$alsamixer -c 0 to use mixer settings on card 0 will return:
no mixer elems found
Unfortunately these is no software control over the hardware mixers on the device (like in any USB device), nothing will show up in mixer programs.
Fortunately, Alsa offers the softvol plugin to create a software volume control. We will also define this control as the default mixer.
Here is my first try:
pcm.!default {
type plug
slave.pcm "softvol"
}
pcm.softvol {
type softvol
slave {
pcm "plughw:UA4FX"
}
control {
name "SoftMaster"
card 0
}
}
Let us have a look at our software mixer:
$amixer
Simple mixer control 'SoftMaster',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 255
Front Left: 255 [100%]
Front Right: 255 [100%]
Recording left and right input channels seperately
When recording from two mono inputs (Input 1/L and Input 2/R), the sound is mixed into a stereo stream at hardware level. Again, there is no software control over this audio device.
This is a problem when you only record from one mono microphone. The resulting stereo sound includes a muted channel with noise. At software level, you may downmix this sound to mono, but this degrades quality because of the muted channel with noise.
A simple solution is to record from left and right input channels seperately, as explained in the dsnoop howto.
pcm.record_left {
type dsnoop
ipc_key 234884
slave {
pcm "plughw:UA4FX"
channels 2
}
bindings.0 0
}
pcm.record_right {
type dsnoop
ipc_key 2241234
slave {
pcm "plughw:UA4FX"
channels 2
}
bindings.0 1
}
Digital signals
The same rules apply here. Alsa has very little control over the UA-4FX hardware. Digital control is done using buttons on the front pane.
Digital In
To record from digital source, you must select DIGITAL from the REC SOURCE switch on the side of the UA-4FX (by the SAMPLE RATE switch). You can then record using any Alsa tool, on the pasymed or SoftMaster PCMs.
Digital Out
With the Edirol UA-4FX in Advanced mode off, you can play 16 bits, 44.100 Hz digital output.
Let us try Alsa utility speaker-test:
speaker-test -c 2 -D softvol0 -twav
Connect an optical cable:
- from Edirol UA-4FX Digital out
- to a Terratec USB Aureon MK-2 digital in.
In the mixer of the Terratec Aureon, select Input 2 and check
IEC958 In.
Record the digital stream using the following command:
arecord -v -f S16_LE -c 2 -D plughw:1,0 foobar.wav
Low latency (to be written)
Investigating. To be written.
MIDI configuration
I don't use MIDI instruments. This information comes from the Ubuntu Forums. You will need Advanced mode support.
For MIDI to work, make sure you are in Advanced mode by turning the Advanced mode switch ON located on the left side of the UA-4FX; you will need to unplug and plug in the device for the change to take effect.
If MIDI is working, you should see a "raw midi" device for the UA-4FX in /proc/asound/devices:
$ grep midi /proc/asound/devices
8: [ 0- 0]: raw midi
Also, /proc/asound/card0/midi0 should exist (assuming the UA-4FX is the 0th audio device):
$ cat /proc/asound/card0/midi0
UA-4FX
Output 0
Tx bytes : 0
Input 0
Rx bytes : 0
MIDI ports
When the UA-4FX Advanced mode is
enabled,
aconnect should show one MIDI input and one MIDI output port:
$ aconnect -il # list readable MIDI ports
client 16: 'UA-4FX' [type=kernel]
0 'UA-4FX MIDI 1 '
$ aconnect -ol # list writable MIDI ports
client 16: 'UA-4FX' [type=kernel]
0 'UA-4FX MIDI 1 '
If you prefer a graphical interface, check out aconnectgui. The
relevant information can also be found in /proc/asound/seq/clients.
Device information
The following section may help Alsa hackers:
cat/proc/bus/usb/devices
Please ignore the OHCI Host Controller and USB Optical Mouse listed in my /proc/bus/usb/devices
$cat /proc/bus/usb/devices
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 8
B: Alloc= 11/900 us ( 1%), #Int= 1, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.24-rc2-git5 ohci_hcd
S: Product=OHCI Host Controller
S: SerialNumber=0000:00:0b.0
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=15ca ProdID=00c3 Rev= 5.12
S: Product=USB Optical Mouse
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 98mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=10ms
T: Bus=01 Lev=01 Prnt=01 Port=05 Cnt=02 Dev#= 4 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0582 ProdID=00a4 Rev= 1.00
S: Manufacturer=EDIROL
S: Product=UA-4FX
C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=360mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I:* If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I: If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E: Ad=01(O) Atr=09(Isoc) MxPS= 192 Ivl=1ms
I:* If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I: If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E: Ad=82(I) Atr=05(Isoc) MxPS= 192 Ivl=1ms
cat /proc/asound/devices
$cat /proc/asound/devices
2: : timer
7: : sequencer
8: [ 0- 0]: digital audio playback
9: [ 0- 0]: digital audio capture
10: [ 0] : control
cat /proc/asound/cards
$cat /proc/asound/cards
0 [UA4FX ]: USB-Audio - UA-4FX
EDIROL UA-4FX at usb-0000:00:0b.0-6, full speed
aplay -l
$aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: UA4FX [UA-4FX], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
$aplay -L
default:CARD=UA4FX
UA-4FX, USB Audio
Default Audio Device
front:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
Front speakers
surround40:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=UA4FX,DEV=0
UA-4FX, USB Audio
IEC958 (S/PDIF) Digital Audio Output
null
Discard all samples (playback) or generate zero samples (capture)
Getting Advanced mode to work
Great Big Warning
Advanced mode offers 24-bit audio at high sample rates (48kHz full duplex, and 96kHz half duplex). However, there's noise added by the hardware on purpose. To figure out how to disable this, which I suppose is for watermarking / DRM purposes, a reverse engineering effort would be required.
I worked through these steps to get almost 100% support for Advanced mode. All that is missing is software-selectable Input Monitor when the switch is set to AUTO. (When it is set to ON, inputs are always sent to outputs.)
First, I checked /proc/bus/usb/devices. (I'm leaving out the OHCI hub and USB Optical Mouse)
$cat /proc/bus/usb/devices
T: Bus=01 Lev=01 Prnt=01 Port=05 Cnt=02 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=ff(vend.) Sub=00 Prot=ff MxPS= 8 #Cfgs= 1
P: Vendor=0582 ProdID=00a3 Rev= 1.00
S: Manufacturer=EDIROL
S: Product=UA-4FX
C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=360mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=02 Prot=02 Driver=(none)
I: If#= 0 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=02 Prot=02 Driver=(none)
E: Ad=01(O) Atr=09(Isoc) MxPS= 288 Ivl=1ms
I:* If#= 1 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=02 Prot=01 Driver=(none)
I: If#= 1 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=02 Prot=01 Driver=(none)
E: Ad=82(I) Atr=05(Isoc) MxPS= 288 Ivl=1ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=03 Prot=00 Driver=(none)
E: Ad=03(O) Atr=02(Bulk) MxPS= 32 Ivl=0ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 32 Ivl=0ms
I: If#= 2 Alt= 1 #EPs= 2 Cls=ff(vend.) Sub=03 Prot=00 Driver=(none)
E: Ad=03(O) Atr=02(Bulk) MxPS= 32 Ivl=0ms
E: Ad=84(I) Atr=03(Int.) MxPS= 32 Ivl=1ms
Next I checked the UA-25 Device Information section and my usb listing seems close enough.
I made a patch, which works on linux-2.6.24 and linux-2.6.25. It looks like tiwai included it in 2.6.28-rc3. Thanks! So instead of using the patch on this page, please upgrade your kernel to linux-2.6.28 or later.
When I load snd_usb_audio now, I get the following in dmesg:
$tail /var/log/dmesg
[ 2459.843069] ALSA sound/usb/usbmidi.c:1406: switching to altsetting 1 with int ep
[ 2459.844389] ALSA sound/usb/usbmidi.c:1297: created 1 output and 1 input ports
[ 2459.844751] usbcore: registered new interface driver snd-usb-audio
The snd_usb_audio driver correctly detects the playback and capture sample rate:
$cat /proc/asound/cards
0 [UA4FX ]: USB-Audio - UA-4FX
EDIROL UA-4FX at usb-0000:00:0b.0-6, full speed
$cat /proc/asound/card0/stream0 # correctly detects 44100, 48000 based on position of SAMPLE RATE switch
EDIROL UA-4FX at usb-0000:00:0b.0-6, full speed : USB Audio
Playback:
Status: Stop
Interface 0
Altset 1
Format: 0x20
Channels: 2
Endpoint: 1 OUT (ADAPTIVE)
Rates: 44100 - 44100 (continuous)
Rates: 48000 - 48000 (continuous)
Rates: 96000 - 96000 (continuous)
Capture:
Status: Stop
Interface 1
Altset 1
Format: 0x20
Channels: 2
Endpoint: 2 IN (ASYNC)
Rates: 44100 - 44100 (continuous)
Rates: 48000 - 48000 (continuous)
Rates: 96000 - 96000 (continuous)
$cat /proc/asound/card0/pcm0p/sub0/hw_params # playing a 44.1 kHz .wav, card at 44.1 kHz
access: MMAP_INTERLEAVED
format: S24_3LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 1024
buffer_size: 16384
tick_time: 4000
$cat /proc/asound/card0/pcm0p/sub0/hw_params # playing a 44.1 kHz .wav, card at 48 kHz
access: MMAP_INTERLEAVED
format: S24_3LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 1024
buffer_size: 16384
tick_time: 4000
$cat /proc/asound/card0/pcm0c/sub0/hw_params # recording a .wav, card at 96 kHz RECORD
access: MMAP_INTERLEAVED
format: S24_3LE
subformat: STD
channels: 2
rate: 96000 (96000/1)
period_size: 1024
buffer_size: 16384
tick_time: 4000
$cat /proc/asound/card0/pcm0p/sub0/hw_params # playing a 44.1 kHz .wav, card at 96 kHz PLAY
access: MMAP_INTERLEAVED
format: S24_3LE
subformat: STD
channels: 2
rate: 96000 (96000/1)
period_size: 1024
buffer_size: 16384
tick_time: 4000
Switching to 48 kHz playback/recording, /proc/bus/usb/devices has a third alternate (Alt=2) for interface 0, and it has 1 endpoint:
C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=360mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=02 Prot=02 Driver=(none)
I: If#= 0 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=02 Prot=02 Driver=(none)
E: Ad=01(O) Atr=09(Isoc) MxPS= 320 Ivl=1ms
I: If#= 0 Alt= 2 #EPs= 1 Cls=ff(vend.) Sub=02 Prot=02 Driver=(none)
E: Ad=01(O) Atr=09(Isoc) MxPS= 312 Ivl=1ms
I:* If#= 1 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=02 Prot=01 Driver=(none)
I: If#= 1 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=02 Prot=01 Driver=(none)
So in createua700ua25_quirk() there's a change to the test for altsettings. (It's in the patch, above.)
Obviously, at 96 kHz the interfaces list is quite different. But everything is detected fine, just like the UA-25. Tested MIDI detection at 96 kHz RECORD, PLAY, 48 kHz, and 44.1 kHz, just fine:
$cat /proc/asound/devices
2: : timer
3: [ 0- 0]: raw midi
4: [ 0- 0]: digital audio playback
5: [ 0- 0]: digital audio capture
6: [ 0] : control
7: : sequencer
$cat /proc/asound/card0/midi0
UA-4FX
Output 0
Tx bytes : 0
Input 0
Rx bytes : 0
Every once in a while, the UA-4FX initializes in an odd state:
$cat /proc/bus/usb/devices
T: Bus=01 Lev=01 Prnt=01 Port=05 Cnt=02 Dev#= 13 Spd=12 MxCh= 0
D: Ver= 1.00 Cls=ff(vend.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0451 ProdID=3200 Rev= 0.00
S: Manufacturer=USB Device - By Haim Eliyahu
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
Patch for 2.6.24 through 2.6.27
Here is a patch for /usr/src/linux-2.6.24/sound/usb/usbaudio.c and usbquirks.h. I have tested it on linux-2.6.24 and linux-2.6.25:
Add Alsa support for Roland Edirol UA-4FX in Advanced mode
(for MIDI support and sample rates of 48 kHz and 96 kHz)
usbaudio.c, usbquirks.h
Signed-off-by: [email protected]
===================================================================
diff -u sound/usb/usbaudio.c.00 sound/usb/usbaudio.c
--- sound/usb/usbaudio.c.00 2007-11-28 02:13:10.000000000 -0700
+++ sound/usb/usbaudio.c 2007-11-28 02:44:47.000000000 -0700
@@ -2930,7 +2930,7 @@
}
/*
- * Create a stream for an Edirol UA-700/UA-25 interface. The only way
+ * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface. The only way
* to detect the sample rate is by looking at wMaxPacketSize.
*/
static int create_ua700_ua25_quirk(struct snd_usb_audio *chip,
@@ -2950,8 +2950,11 @@
struct audioformat *fp;
int stream, err;
- /* both PCM and MIDI interfaces have 2 altsettings */
- if (iface->num_altsetting != 2)
+ /* both PCM and MIDI interfaces have 2 altsettings,
+ * except UA-4FX at 48 kHz, PCM interface has 3 altsettings */
+ if (iface->num_altsetting != 2 &&
+ (chip->usb_id != USB_ID(0x0582, 0x00a3) ||
+ iface->num_altsetting != 3))
return -ENXIO;
alts = &iface->altsetting[1];
altsd = get_iface_desc(alts);
diff -u sound/usb/usbquirks.h.00 sound/usb/usbquirks.h
--- sound/usb/usbquirks.h.00 2007-11-28 02:15:11.000000000 -0700
+++ sound/usb/usbquirks.h 2007-11-28 02:17:51.000000000 -0700
@@ -1311,6 +1311,37 @@
}
},
/* TODO: add Edirol MD-P1 support */
+{ /*
+ * This quirk is for the "Advanced" modes of the Edirol UA-4FX.
+ * If the switch is not in an advanced setting, the UA-4FX has
+ * ID 0x0582/0x00a4 and is standard compliant (no quirks), but
+ * offers only 16-bit PCM at 44.1 kHz and no MIDI.
+ */
+ USB_DEVICE_VENDOR_SPEC(0x0582, 0x00a3),
+ .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+ .vendor_name = "EDIROL",
+ .product_name = "UA-4FX",
+ .ifnum = QUIRK_ANY_INTERFACE,
+ .type = QUIRK_COMPOSITE,
+ .data = (const struct snd_usb_audio_quirk[]) {
+ {
+ .ifnum = 0,
+ .type = QUIRK_AUDIO_EDIROL_UA700_UA25
+ },
+ {
+ .ifnum = 1,
+ .type = QUIRK_AUDIO_EDIROL_UA700_UA25
+ },
+ {
+ .ifnum = 2,
+ .type = QUIRK_AUDIO_EDIROL_UA700_UA25
+ },
+ {
+ .ifnum = -1
+ }
+ }
+ }
+},
{
/* Roland SH-201 */
USB_DEVICE(0x0582, 0x00ad),