Questions and Answers
What is ASIO4ALL v2 used for?
WDM Audio
ASIO4ALL is recommended to be used with other power settings disabled.
True
What should you do if your audio software does not provide an ASIO control panel option?
What setting on ASIO4ALL should be adjusted if you start hearing crackles or distorted audio?
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What does ASIO4ALL do to 44.1 kHz audio when necessary?
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ASIO4ALL can improve the resampling quality of AC97 devices.
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What should you do to improve stability when playing software synths live?
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To work around AC97 devices that report 20 Bits resolution but cannot be opened for more than 16 Bits, force the WDM driver to ______ Bit.
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Match the usage scenario with the recommended action:
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Study Notes
Introduction to ASIO4ALL v2
- ASIO4ALL v2 is a universal ASIO driver for WDM audio devices.
- It provides advanced features for optimizing audio performance.
- To achieve the best results, the computer should be configured to:
- Set the power scheme to "Always On" (XP) or "High Performance" (Vista) to turn off Processor P-State switching.
- Turn off system sounds to prevent conflicts with ASIO4ALL.
Getting Started with ASIO4ALL
- To use ASIO4ALL, configure the audio software to select ASIO -> ASIO4ALL v2.
- The ASIO control panel can be launched from the audio software or by clicking on the ASIO4ALL status icon in the System Tray area.
- Changes made in the control panel may not take effect until the audio application is restarted.
Basic Configuration
- The ASIO control panel displays a list of WDM audio devices found in the system.
- Each device has a button to activate or disable it.
- The device list shows the current state of each device:
- Active: The device has been successfully started by the audio engine.
- Inactive: The device is available for use but has not been started.
- Unavailable: The device is in use elsewhere or cannot be used.
- Beyond Logic: The device refuses to start or displays erratic behavior.
- The ASIO buffer size can be adjusted to achieve lower latency, but may cause crackles or audio distortion at smaller sizes.
Advanced Configuration
- The control panel can be switched to advanced mode, which provides additional configuration options.
- The device list can be expanded to show Devices, Device Interfaces, and Pins (WDM audio architecture).
- Each item in the device list can be selectively enabled or disabled.
- Multi-device setups can be created, but require that all devices involved are running from the same clock source.
- Latency compensation sliders can be used to adjust for unknown latencies.
- Hardware buffering can be enabled for WavePCI miniports, which can reduce CPU usage and latency.
Common Usage Cases and Optimizations
- Playing software synths live:
- Disable all audio inputs and outputs not in use.
- Disable all channels not in use.
- Computer as effects processor:
- Disable all channels not in use.
- Disable 44.1 kHz resampling if not necessary.
- General-purpose sequencer setup:
- Relax latency requirements to avoid dropouts.
- Use an ASIO buffer size that feels comfortable with all favorite VST plugins active.
- Latency does not matter a lot:
- Disable all inputs and outputs not in use.
- Set the ASIO buffer size to the maximum.
Using ReWuschel
- ReWuschel allows ASIO4ALL inputs to be accessed as ReWire inputs.
- This can be used for applications that only allow ASIO output, but support ReWire.
Troubleshooting
- Common issues:
- ASIO4ALL not visible in host audio configuration menu.
- Audio device flagged as "Unavailable" or "Beyond Logic".
- Cannot play sound from another application when ASIO4ALL is active.
- Meters are moving, but there is no sound.
- Changes made in the control panel do not propagate between different audio applications.
- Solutions:
- Check if the audio application supports ASIO.
- Try restarting the audio host application.
- Check for "MS GS Software Wavetable Synth" or similar configurations.
- Try unplugging and replugging the device.
- Disable SPDIF output in the ASIO4ALL control panel.
- Correctly assign ASIO channels in the audio application.
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Description
Learn about the ASIO4ALL v2 universal ASIO driver for WDM audio, including its features and installation. This quiz is based on the instruction manual.
