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Add DAMC as a good Alternative #154

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145 changes: 131 additions & 14 deletions faq/multiple_devices.md
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Expand Up @@ -11,19 +11,136 @@ off the time between audio samples). This means that trying to use
multiple independent soundcards is problematic, because each soundcard
has its own sample clock, running independently from the others. Over
time, these different clocks drift out of sync with each other, and
cause glitches in the audio. You can't stop this drift, although in some
cases the effects may be insignificant enough that some people might not
care about them.
cause glitches in the audio. You can stop this drift with the correct
tools, although it is not very easy.

But there are some tools that can help you with that problem.

### 1. Use DAMC to output / input to multiple Devices

The Open Source Program DAMC let's you add audio devices to JACK.
Clock shifting is supported.

DAMC uses Portaudio to send / recieve the Audio, so on Linux you
will be limited to ALSA.

DAMC Download here: https://github.com/amurzeau/damc/releases/latest

Each JACK client managed by DAMC do:
Receive audio from other Jack clients or from various external sources
Do processing on the audio stream (like volume, eq, compression, ...)
Output audio to other Jack clients or to external sinks.

Note: DAMC was not tested on Mac

To use DAMC you need to have JACK already set up.

#### Windows:

1. Start JACK
2. Run damc_server.exe
3. Run damc_gui.exe
4. In the DAMC GUI, click Add button to add a JACK client that
can receive/send audio

5. Configure:
Display Name: name shown in QJackCtl and in DAMC GUI
Type:
Loopback: received audio is send on its outputs through enabled filters
RemoteOutput: received audio is sent on the network using UDP to
specified target IP / port address. VBAN format is
required to be compatible with Voicemeeter.
RemoteInput: receive audio from the network by listening on specified
IP / port for incoming UDP packets and send it to jack
client's outputs.
DeviceOutput: received audio is sent to specified device. The device
is managed using Portaudio.
DeviceInput: audio is capture from specified device using Portaudio.
WasapiDeviceOutput: received audio is sent to specified device.
The device is managed using WASAPI.
WasapiDeviceInput: audio is capture from specified device
using WASAPI.
Channels: the number of channel this jack client must handle
(for example: 2 for stereo audio)
Sample rate:
Sample rate: the sample rate of the external portaudio /
WASAPIdevice or the remote UDP endpoint
Clock drift: adjust the sample rate clock drift in Part Per Million
The Clock drift will be shown in the log of damc_server
Remote output:
IP / Port :
With RemoteOutput: the target IP / Port which will receive
audio over UDP
With RemoteInput: the IP / Port to bind to listen for incoming
audio UDP packets
VBAN format: use Voicemeeter packet format
Device output:
Device: The external device to send / receive audio
Use Exclusive mode: use exclusive WASAPI mode (can be used with
Portaudio too when using a WASAPI device)

6. Close DAMC GUI if you are done setting up DAMC

7. In QJackCtl, click the Graph button and connect jack clients together

Thus in an ideal world you should not use multiple independent
soundcards but instead use a single device with a single clock and all
the inputs, outputs and other features that you need.

Of course, a lot of people don't live in an ideal world, and believe
that software should make up for this. Accordingly, JACK offers several
ways for you to use more than 1 device at a time.
#### Linux

### 1. Use the alsa_in and alsa_out clients (Linux & ALSA only)
1. Start JACK
2. Install the following Libraries:
lib32-zlib, zlib, libuv, spdlog, portaudio, lib32-portaudio,
fftw, libmysofa
For Arch Users:
sudo pacman -S lib32-zlib zlib libuv spdlog portaudio lib32-portaudio fftw libmysofa
NOTE: The Names of the Packages might not be the same if you are using
another Distro like Ubuntu
3. Open a Terminal in the Directory of the DAMC Folder
4. Run the following Command:
sudo cp lib/libportaudio.so.19.8 /lib/libportaudio.so.19.8
5. Run damc_server in a terminal
6. Run damc_gui
7. In the DAMC GUI, click Add button to add a JACK client that
can receive/send audio
8. Configure:
Display Name: name shown in QJackCtl and in DAMC GUI
Type:
Loopback: received audio is send on its outputs through enabled filters
RemoteOutput: received audio is sent on the network using UDP to
specified target IP / port address. VBAN format is
required to be compatible with Voicemeeter.
RemoteInput: receive audio from the network by listening on specified
IP / port for incoming UDP packets and send it to jack
client's outputs.
DeviceOutput: received audio is sent to specified device. The device
is managed using Portaudio.
DeviceInput: audio is capture from specified device using Portaudio.
WasapiDeviceOutput: received audio is sent to specified device.
The device is managed using WASAPI.
WasapiDeviceInput: audio is capture from specified device
using WASAPI.
Channels: the number of channel this jack client must handle
(for example: 2 for stereo audio)
Sample rate:
Sample rate: the sample rate of the external portaudio /
WASAPIdevice or the remote UDP endpoint
Clock drift: adjust the sample rate clock drift in Part Per Million
The Clock drift will be shown in the log of damc_server
Remote output:
IP / Port :
With RemoteOutput: the target IP / Port which will receive
audio over UDP
With RemoteInput: the IP / Port to bind to listen for incoming
audio UDP packets
VBAN format: use Voicemeeter packet format
Device output:
Device: The external device to send / receive audio
Use Exclusive mode: use exclusive WASAPI mode (can be used with
Portaudio too when using a WASAPI device)

9. Close DAMC GUI if you are done setting up DAMC

10. In QJackCtl, click the Graph button and connect jack clients together

### 2. Use the alsa_in and alsa_out clients (Linux & ALSA only)

If you are using JACK on Linux and want to use additional devices that
have ALSA driver support (i.e. most PCI, USB and Bluetooth devices),
Expand Down Expand Up @@ -52,11 +169,11 @@ FFADO- supported device. The requirement for ALSA support only applies
to the extra devices you want to use, not the one that JACK itself is
using.

### 2. Use the JACK2 audio adapter(s) (Jack2 only)
### 3. Use the JACK2 audio adapter(s) (Jack2 only)

_More information is needed on this option_

### 3. Using OS facilities to merge devices into a single pseudo-device
### 4. Using OS facilities to merge devices into a single pseudo-device

Both OS X and Linux provide ways to configure your machine so that it
appears to have a new audio device that is actually a combination of one
Expand Down Expand Up @@ -212,7 +329,7 @@ always be the same one, and so forth, so its not likely to be an issue.
If you use several identical USB devices, it may be a more significant
problem.

### 4. Using the -P and -C arguments to a JACK backend
### 5. Using the -P and -C arguments to a JACK backend

Several JACK backends, including the ALSA, FFADO and CoreAudio versions,
support the -P and -C arguments that can be used to specify two
Expand Down