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A single XR2206 can play a single frequency. It can be a square-wave, a triangle-wave, a pretty good sine-wave or a fuzzy sine-wave (higher distortion).
It turns on and off abruptly like a car's horn, not with the particular attack time, sustain time and fall time of the waveform shape of a musical instrument.
It plays only one frequency so chords cannot be played.
My suggestion is this. Before you order any parts, decide what functionality you want to have in your musical device. Determine if you have the ability to acheive these functions with your knowledge.
develop a good functional block diagram of what you want to do.
Once you have your block diagram, then start your parts search, and create schematics.