User manual ASIO4ALL DRIVER FOR WDM AUDIO VERSION 2

[. . . ] ASIO4ALL v2 Universal ASIO Driver For WDM Audio - Instruction Manual Last reviewed: 08/15/08 Table of Contents Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Setting up your audio software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Basic Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Advanced Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Common Usage Cases Optimizations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Using "ReWuschel". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Fortunately, most USB devices will automatically synchronize themselves for as long as the host controllers they are connected to have a common clock source, which is trivially true for the USB host controllers embedded in the south bridge on any mainboard. Note: If devices are not accurately synced, their audio streams are likely to drift apart over time!On the right side of the panel are the advanced controls (5. . 9). Latency Compensation Since ASIO4ALL does not have sufficient knowledge of the underlying hardware/driver architecture, it can only guess the actual latencies involved. With these sliders you can compensate for the latencies unknown to ASIO4ALL such that recordings in your sequencer Software are properly aligned with the rest. Note: In multi-device-setups the largest respective value of all devices will be used. Therefore, if different devices have different inherent latencies, audio placement will not be accurate for some devices! 6. Hardware Buffer on/off Note: For WaveRT drivers (Vista), this box is labeled "Allow Pull Mode (WaveRT)" instead!"Allow (WaveRT)" Enables the hardware buffer for the highlighted device. This only works for so called "WavePCI" miniports, as other types of WDM drivers do not usually allow direct access to the hardware buffer. Adjustment for best hardware buffer performance involves the "ASIO Buffer Size" slider and the "Buffer Offset" slider (see below). Hardware buffering works best for rather small ASIO buffer sizes. Try something between 128 and 256 samples as a starter!The biggest advantage of using the hardware buffer is that this method uses a lot less CPU. In addition, it may be possible to decrease latencies even further. In multi-device-setups, it is possible to mix Hardware-buffered devices with devices that are not. This, however, is not particularly recommended!If hardware buffering is not supported by a particular audio device, there will be an additional latency of a couple hundred milliseconds, which is clearly audible. "Allow Pull Mode (WaveRT)" There are two basic access methods for a WaveRT device, "pull-mode" (also called "event-mode") and "push-mode" (also called "polling mode"). "push-mode" is thought to be supported by all WaveRT drivers and (Vista) OS platforms, whereas "pull-mode" wasn't even officially documented by Microsoft until almost one year after Vista went RTM. As a consequence, "pull-mode" is still broken in a number of instances. If this box is left unchecked, ASIO4ALL will never use "pull-mode", otherwise it will use it whenever possible. [. . . ] Once successfully installed, ASIO4ALL v2 should not require Administrator privileges anymore in order to run. · Audio device flagged as "Unavailable" or "Beyond Logic" even though it is not in use elsewhere You want to make sure the "MS GS Software Wavetable Synth" or anything by a similar name is not enabled anywhere in you MIDI setup. The ASIO4ALL Web Site has further information on that. If any such "Software Wavetable Synth" (sometimes in disguise as ". . . DLS Synth. . . ") can be ruled out as the cause, try to restart the audio host application. Sometimes, when switching from another driver to ASIO4ALL v2, the previous driver will not release the audio device in time. [. . . ]