ALSA - Signalink USB

.asoundrc

# Use this file for a user-configurable ALSA soundcard setup.
# Place in the user's home folder (/home/ham/.asoundrc).

# This file is built for a Tigertronics Signalink USB, a USB
# soundcard designed to interface a computer with an amateur
# radio transceiver for digital mode operation. This
# configuration allows multiple programs to access the same
# sound device simultaneously without blocking the device.
# This configuration is built on a custom modprobe
# configuration file (/etc/modprobe.d/alsa-base.conf) to
# force consistent device labeling. While adjusting parameters,
# it is not necessary to reboot or log out to see changes.
# Simply save this file, restart the programs using the card
# and select the device in the software (if naming changed).

# Some notes about the Signalink USB:
# Different programs require different sampling rates, ie
# WSJT-X _requires_ 48 kHz sampling (thanks to K9YC for the tip!),
# while fldigi allows custom sampling rates (given the device
# supports them). The native sampling rate for the SLUSB is
# 44.1 kHz, but it supports up to 48 kHz. For this config,
# I used 48 kHz to satisfy WSJT-X, then adjusted fldigi to match.
# Other software requires various numbers of channels, ie qsstv.
# While the device has only 1 channel for each input and output,
# ALSA may split or join streams with plugins.

#####################################################################
# Software settings:
#####################################################################

# Fldigi:
# Mono or stereo io
# In stereo mode, tx audio is on right channel, so will require
# channels to be swapped in audio settings.

# WSJT-X:
# Mono or stereo io
# In stereo mode, tx audio is on right channel only.
# Rx audio may use either channel but not both or mono.

# QSSTV:
# Stereo-only io
# Rx audio pulls from one channel only, so splitting the stream to
# stereo mode results in audio in all cases.
# Tx audio is only one channel, likely right, so must be swapped in
# audio settings.

# Direwolf:
# Mono or stereo io, depending on the number of modems to run.
# Each modem requires its own tx and rx channel, so channel count
# must match.

# ARDOP:
# Modem requires a special 12ks/s rate, but is able to use
# mono (preferred) or stereo io.


# SIGNALINK

pcm.SIG {
	type hw
	card "SIGNALINK"
	rate 48000
	channels 1
	nonblock 0
	hint.show off
	hint.description "SLUSB hw device"
}

pcm.SIG_AUTO {
	type plug
	slave.pcm "SIG"
	hint.show on
	hint.description "Signalink auto device conversion"
}

# XONAR U5

pcm.XONAR {
	type hw
	card "U5"
	rate 192000
	channels 2
	nonblock 1
	hint.show off
	hint.description "Xonar U5"
}

pcm.XON_AUTO {
	type plug
	slave.pcm "XONAR"
	hint.show on
	hint.description "XONAR auto device conversion"
}

# XONAR device is full-duplex stereo. FT-736R uses a stereo jack to input and
# output data on opposite channels (right, left respectively). Simple hardware
# solution is to run a Y-splitter to I/O ports and downmix to proper channel.

pcm.736_TX {
	type route
	slave.pcm "XON_AUTO"
	slave.channels 2
	ttable {
		0.0 0.5
		1.0 0.5
		0.1 0
		1.1 0
	}
	hint.show off
	hint.description "Mix to left channel"
}

pcm.736_RX {
	type route
	slave.pcm "XON_AUTO"
	slave.channels 2
	ttable {
		0.0 0
		1.0 0
		0.1 0.5
		1.1 0.5
	}
	hint.show off
	hint.description "Mix to right channel"
}

pcm.XON_736 {
	type asym
	playback.pcm "736_TX"
	capture.pcm "736_RX"
	hint.show on
	hint.description "XONAR device for FT-736R"
}

# SDR Loopback device
# This device consumes audio from SDR_IN and spits it out SDR_OUT.
# This allows local software to consume audio exactly as if it were
# coming from a physical card. As with the Signalink, use dmix and
# dsnoop plugins to allow multiple clients to use the device. Since
# there is no transmit capability in most SDRs, only one consumer
# is needed and no transmit audio is needed.
pcm.SDR_IN {
	type hw
	card "SDRLB"
	device 0
	subdevice 0
	format "S16_LE"
	channels 1
	rate 48000
	nonblock 1
	hint.show on
	hint.description "Send nc packets here"
}

pcm.SDR_OUT {
	type hw
	card "SDRLB"
	device 1
	subdevice 0
	format "S16_LE"
	channels 1
	rate 48000
	nonblock 1
	hint.show on
	hint.description "SDR Rx audio"
}

pcm.SDR_ARDOP {
	type plug
	slave {
		pcm "SDR_OUT"
	}
	hint.show on
	hint.description "SDR device for ARDOP"
}

pcm.SDR_IN_AUTO {
	type plug
	slave {
		pcm "SDR_IN"
	}
	hint.show on
	hint.description "Send nc packets here"
}

pcm.SDR_OUT_AUTO {
	type plug
	slave {
		pcm "SDR_OUT"
	}
	hint.show on
	hint.description "Connect decoder here"
}

70-alsa-permanent.rules

# udev rules for soundcard names. This file does nothing but make
# sound device names more human-readable. Place in:
# /etc/udev/rules.d/70-alsa-permanent.rules

SUBSYSTEM!="sound", GOTO="usb_audio"
ACTION!="add", GOTO="usb_audio"

ATTRS{idVendor}=="08bb", ATTRS{idProduct}=="2904", ATTR{id}="SIGNALINK"
ATTRS{idVendor}=="046d", ATTRS{idProduct}=="081a", ATTR{id}="WEBCAM"
ATTRS{idVendor}=="0b05", ATTRS{idProduct}=="17f5", ATTR{id}="U5"
ATTRS{idVendor}=="046d", ATTRS{idProduct}=="0a87", ATTR{id}="G935"

LABEL="usb_audio"

alsa-base.conf

# This is a configuration file for modprobe (/etc/modprobe.d/alsa-base.conf)
# to force specific device ordering and indexing. This then exposes the devices
# to ALSA in the proper order regardless of the number of devices plugged in or
# the order they were connected.

# 0: HDMI
# 1: SIGNALINK: 08bb:2904
# 2: Asus Xonar U5: 0b05:17f5
# 3: WEBCAM: 046d:081a
# 4: SDR_LB: virtual loopback device
# 5: Logitech G935: 046d:0a87


# Force snd-usb-audio to be second loaded sound module in modprobe
options snd slots=,snd-usb-audio,snd-aloop
# Force index order of specific sound cards for predictable ordering and indexing
options snd-usb-audio index=1,2,3,5 vid=0x08bb,0x0b05,0x046d,0x046d pid=0x2904,0x17f5,0x081a,0x0a87
options snd-aloop enable=1 index=4 pcm_substreams=4 id=SDRLB
# Hide on-board Intel audio chip (I don't use it)
options snd-hda-intel probe_mask=0xffff