Realtime equalizer for arbitrary playback software using ASIO SDK 2.3 I/O

Question

I want to develop an equalizer that runs in the background and process the incoming audio signal from whichever audio playback software using the asio4all driver in real-time, with a variable buffer size from 64 samples. The goal is to keep latency as low as possible

I've been thinking of ways to implement this equalizer. How should it takes the incoming stream of an arbitrary playback software(knowing it use asio4all of source) is not clear to me.

My coding template is [hostsample.cpp] in the asio SDK but maybe it's not enough. I haven't explored other sample in Asio SDK yet.

Any advice appreciated!