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.
4. Firewire (recommended) or USB Audio interface. Look for the one that supports ASIO drivers for recording. The number of inputs and outputs depends on your need. If you are a singer/songwriter that will be recording only two-tracks at the same time (guitar and vocals), then a two-input audio interface is enough.