The key thing to notice here is that we have written out individual parts for two instruments, a trumpet and a trombone – one after the other – and when you play the score, you will hear both instruments playing at the same time, in harmony. The same example we just wrote with chords could also be written like this using a combination of chords and voices: VoicesĪnother way to represent notes played at the same time in Alda is with voices. This makes it convenient to describe chords from the bottom up or top down. Sharps and flats can be added to a note by appending + or -.Īlso note that it is possible to change octaves mid-chord using. You can do that in one of two ways: you can use to go down or up by one octave or, you can jump to a specific octave InĪlda, each instrument starts in octave 4, and remains in that octave until you Go above that B, the notes start over from C and you are in a new octave. Notation, starts on a C and goes up to a B. Next octave.” An octave, in scientific pitch You should hear the piano continuing upwards in the C major scale. Until you change instruments, any notes that you enter into the REPL willĬontinue to be played by the piano. It’s important to note that the piano is now the currently active instrument. Now you should hear a piano playing those four notes. Why? Well, we haven’t told Alda what instrument we want to play these notes. Try typing this into the REPL and pressing Enter… nothing happens. Here we have four quarter notes: C, D, E and F. Let’s translate this measure of sheet music into Alda code: You can type snippets of Alda code into the REPL, press Enter, and hear the results instantly. We will use the Alda REPL ( Read- Evaluate- Play Loop) at first, toĮxperiment a little with Alda syntax. Before we get started, go ahead and install Alda, if you haven’t
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