RS ASIO

This project aims to add ASIO support to Rocksmith 2014 Edition - Remastered in order to avoid issues with some WASAPI drivers. It patches game code at runtime to allow intervening in the process of WASAPI device enumeration so that we can inject our own fake WASAPI devices which internally use ASIO audio API.

How to use

Copy the contents (avrt.dll, RS_ASIO.dll, RS_ASIO.ini) of latest release (zip arhive release-xxx.zip) to the game folder.
- Only the Steam version of Rocksmith is currently supported. You can find local folder of a game by right clicking on a Rocksmith in your Steam library, and selecting menu "Manage" -> "Browse local files"
Modify the RS_ASIO.ini file to configure which ASIO driver to use, and which channels etc...
Look into basic configuration guide
Make sure Rocksmith.ini is set to run with ExclusiveMode=1 and Win32UltraLowLatencyMode=1. If in doubt, use default settings.
Make sure your interface clock is set to 48kHz. RS ASIO will try to request 48kHz mode, but your drivers may or may not allow this, so it might help setting it manually.
Extra: An RS_ASIO-log.txt file is generated inside the game directory which may help discover your ASIO driver name and diagnose issues.
Look into list of knows issues if you experience any problems

How to remove/uninstall

Remove the custom DLL files from the game folder.

Audio Interfaces reported to work well

Audient iD4
Behringer U-Phoria UM2 (see this for more details)
Behringer UMC1820
Behringer UMC202HD
Behringer UMC204HD
ESI MAYA22 USB
Focusrite Clarett 4Pre USB
Focusrite Saffire Pro 40
Focusrite Scarlett 2i2 1st Gen (Known issues)
Focusrite Scarlett 2i2 2nd Gen (Known issues)
Focusrite Scarlett 2i2 3rd Gen (Known issues)
Focusrite Scarlett 2i4 1st Gen (Known issues)
Focusrite Scarlett 2i4 2nd Gen (Known issues)
Focusrite Scarlett 4i4 3rd Gen (Known issues)
Focusrite Scarlett 6i6 2nd Gen (Known issues)
Focusrite Scarlett 18i20 2nd Gen (Known issues)
Focusrite Scarlett Solo 2nd Gen (Known issues)
Focusrite Scarlett Solo 3rd Gen (Known issues)
Juli@ XTe
Lexicon Alpha
Line6 HX Stomp
M-Audio 2x2
M-Audio M-Track Plus II
M-Audio MobilePre mkII
Mackie Onyx Producer 2x2
Native Instruments Komplete Audio 6
MOTU 2408 mk3
MOTU M4
MOTU UltraLite AVB
Presonus Quantum 2
RME Babyface PRO
RME Multiface with HDSPe PCIe
Roland Rubix 44
Steinberg UR22mkII
Universal Audio Apollo Twin USB
XTONE Smart Stomp, using ASIO4All
Zoom U-44

Basic configuration guide

Follow installation steps, described above
Run Rocksmith for the first time.
Look into RS_ASIO-log.txt, you will see names of drivers

0.456 [INFO]  AsioHelpers::FindDrivers
0.456 [INFO]    ASIO4ALL v2
0.457 [INFO]    MOOER USB Audio
0.457 [INFO]    XMOS USB Audio 2.0 ST 3086
0.457 [INFO]    ZOOM R16_R24 ASIO Driver

Copy name of the corresponding driver to the [Asio...] block of the RS_ASIO.ini
Run Rocksmith again
Repeat until there is no cracks in audio. Your goal is to have smallest possible values without cracks. Find smallest possible LatencyBuffer and then gradually set buffer size until there is no cracks.
1. Modify LatencyBuffer (try values 4,3,2,1)
2. Modify buffersize either in ASIO driver control panel or in CustomBufferSize option in the RS_ASIO.ini file. For the beginning follow rule of thumb that buffer size should be divisible to 32
3. Run Rocksmith
4. Look into RS_ASIO-log.txt if you experience any issues

Known issues

Your interface MUST support 48kHz playback
Doesn't provide a way to open the ASIO control panel (please configure your interface elsewhere for now, if needed).
Will need a game reboot if ASIO settings are changed while the game is running (such as changing sample rate, sample type etc).
Some Focusrite devices have been reported to only output sound properly when using ASIO buffer sizes of 48, 96 or 192. You can use the custom buffer size setting on RS_ASIO.ini for this.
Hardware hotplugging while the game is running won't be noticed by the game.
Game sometimes crash on exit (under investigation)

matthew-p / rs_asio