Universal asio driver For wdm audio Instruction Manual

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7. Kernel Buffers/Buffer Offset
If hardware buffering is disabled, this control lets you add up to two more buffers to be queued for audio 
output. Each additional buffer increases the output latency of the device by the time it takes to play one 
buffer. Therefore, the initial setting of “2” should only be changed on less powerful machines, where 
reasonably small ASIO buffer sizes cannot be achieved with the default setting. 
If hardware buffering is enabled, this control determines the amount of clearance (in ms) between where 
ASIO4ALL will insert data into/read data from the hardware buffer, and the position where ASIO4ALL 
currently thinks the hardware read/write position is. Sound complicated already? You haven't even seen 
the code that calculates this...
As a general rule: Higher settings increase latencies and stability, lower settings have the adverse effect.
You should, however, be able to achieve a setting that is very close to zero (“4ms” would still be 
considered “very close to zero”, while “10ms”, the default, would indicate that there is room for 
improvement.)
With Envy24-based PCI-sound cards, there may be an option in your sound card control panel that reads 
“DMA Buffer Transfer Latency” (Seen with Terratec products) or similar. You should set this to the 
lowest possible value, e.g. “1ms” for best results.

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8. Always Resample 44.1<->48 kHz
ASIO4ALL can do real time resampling of 44.1 kHz audio to/from 48 kHz. Resampling will 
automatically take place whenever ASIO4ALL is opened for 44.1 kHz and the WDM driver does not 
support this sample rate.
There may, however, be instances in which case an AC97 will support 44.1 kHz by resampling internally. 
More often than not, however, AC97 resampling quality is extremely poor and/or prone to stability 
issues. To work around this, you can enable this option. With at least one incarnation of the SoundMax 
WDM driver (smwdm.sys), this option absolutely must be enabled in order to make it work at 44.1 kHz 
at all.