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A guitar is a string instrument, and each of those strings make a sound when you play them. For this example we'll focus on the happy path, which is that plucking the string plays the expected note. The code I built also considers that strings can break, and attempting to play broken strings won't work. You can look at the full implementation to see how that works.
This is all in a string (the data type, not the part of the instrument), because we're going to pass it to Sonic Pi via the sonic-pi-cli gem. This is going to execute the note method in Sonic Pi to play that single tone.
We'll then take all of those notes and pass them to our amplifier, using Sonic Pi's play_pattern_timed method. This also allows us to define a time between each note, so we can place a small amount of time in between each to simulate the time it would take your hand to complete a downstroke across all the strings.
In our last post, I talked about how I built an interface to Sonic Pi when I was preparing my RubyConf 2020 talk about Ruby's Coverage module. At the end of that post, we could send sounds to Sonic Pi. Today, we'll have our code play the guitar, and send those sounds to our amplifier.