User Guide

Chapter 6: ASIO 31
Chapter 6: ASIO
ASIO Audio/Software synth driver support has been added.
Now there’s almost no latency (delay) for audio or software synths like the Roland VSC! By using an ASIO audio
driver, software synths like the Roland VSC (DXi or VSC) will play with almost no latency (delay is only 5-10ms).
So you’ll hear the sounds instantly, and be able to play along using MIDI Thru with the same ultra-low latency.
On the Preferences [Audio] tab, you’ll see the following options for
Audio Driver Type: MME or ASIO.
MME is the default audio driver type that is used in Windows. MME is
good, but there is latency (delay) associated with MME drivers.
For this reason, Steinberg developed a faster type of audio driver system, called ASIO. It allows for much lower
latency than ordinary MME drivers do.
Note: Most low-end sound cards do not include an ASIO driver, so you may not have an ASIO driver yet. In this case, you’ll
need to get an ASIO driver from the Internet.
This “ASIO Driver Dialog” lets you choose an ASIO driver. You can arrive at this dialog in 3 different ways:
1) If you haven’t used ASIO drivers, but Band-in-a-Box detected them, and you answered “Yes” when Band-
in-a-Box asked if you want to use an ASIO driver.
2) If, within the Audio Preferences, you change the Audio Driver Type from MME to ASIO.
3) If the Audio Driver Type is already set to ASIO, but you later press the [Audio Drivers…] button in the
Audio Preferences.
The Select one ASIO Driver list box lets you select an ASIO driver to use. You can only select one ASIO driver at
a time.
Once you have selected an ASIO driver, you will see the Input Port and Output Port list boxes filled with your
driver’s input and output ports. By default, the first of each will be selected. You are allowed to select different
ports (but only one input and one output port at a time can be selected). The ports you selected will be available for
output within Band-in-a-Box. If you do not hear input or output, then you may need to try different ports than the
defaults. You may need to read your sound card’s instructions to determine the correct ports to use.
The ASIO Driver’s Control Panel button launches the Control Panel for your driver. This usually lets you adjust the
latency by letting you choose different buffer sizes in milliseconds. Some drivers might let you choose the buffer
size in samples, which is less convenient than milliseconds. The smaller the buffer size, the lower the latency, and
the faster the response. Smaller buffers require more CPU power and if you hear dropouts or artifacts, you may
need to increase the buffer size. See the Understanding Latency section that follows.
Since many ASIO drivers do not support multiple sample rates, Band-in-a-Box has a built-in resampler which lets
you play and record songs that have a different sampling rate than the rate(s) directly supported by your ASIO
driver. For example, if the driver does not support 44.1K sampling rate, but supports 48K, then Band-in-a-Box will
use the resampler to convert to 48K when playing back, and to convert FROM 48K when recording. The
Resampler Quality combo lets you choose Fast, Good, Better, or Best. Fast is the quickest, but is the lowest of the
four levels of quality. Best is the slowest (uses more CPU time), but the most transparent and accurate quality.
The ASIO Driver’s Control Panel button launches a settings dialog specifically provided by your driver
manufacturer. This usually lets you adjust the latency, and usually you will have a choice between buffer sizes in
milliseconds. See the Understanding Latency section later below.
The Driver Info field shows various characteristics of your driver.
The Name is the driver’s name.
The Version is the version number of your driver.