The older computers also ran around 1 to 4 megahertz (MHz), whereas the Raspberry Pi runs at 700 MHz. And the Raspberry Pi is far from the average home PC. Today, boxes with 2 GB RAM and 2 GHz processor speed are common.
ASIO is a standardized way of describing the communication between audio software and a piece of audio hardware. It enables audio hardware manufacturers to write optimized drivers for their hardware that bypass the potentially high latency operating system mechanism for supporting audio hardware.
If you are using the 'Primary Sound Driver' audio driver only one track at a time can output to the primary output (usually this is the Master Track). 1  This limitation does not apply if you use an ASIO driver, then any Mixer track may be routed to any available output.