from the realband upgrade manual
Support for using ASIO with multiple programs at once. Previously, if you were using an ASIO driver
(so that you have low latency), you could only use ASIO with one program at a time. Now you can use
multiple programs at once with ASIO - for example RealBand and Band-in-a-Box at the same time. This
requires using the Steinberg® ASIO Multi-Client Wrapper, which you can download here:ftp://ftp.steinberg.net/Download/Hardware/ASIO_multiclient_driver/
To get this function working:
1. install the ASIO Multi-Client-Wrapper
2. Run the ASIO Multi Server, and select your ASIO Driver (e.g. ASIO4ALL). The ASIO Server is
a program located in “C:\Program Files (x86)\vidance\asiomulti\asioserver.exe”
3. Run RealBand, and choose Prefs-Audio-Driver Type ASIO, and then select ASIO Multi-Client
Wrapper” as your ASIO driver.
Note: that you may have to reboot your PC after you have installed any new ASIO Drivers.
The steps above need only be done once. The next time you run RealBand, things will already be setup.